USRA B-MOD RULES

2023 USRA B-MOD RACING RULES

THE RULES AND/OR REGULATIONS SET FORTH HEREIN ARE DESIGNED TO PROVIDE FOR THE ORDERLY CONDUCT OF RACING EVENTS AND TO ESTABLISH MINIMUM ACCEPTABLE REQUIREMENTS FOR SUCH EVENTS. THESE RULES SHALL GOVERN THE CONDITION OF SPEEDWAY EVENTS AND, BY PARTICIPATING IN THESE EVENTS, ALL RACEWAY COMPETITORS ARE DEEMED TO HAVE COMPLIED WITH THESE RULES. NO EXPRESS OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATION OF, OR COMPLIANCE WITH THESE RULES AND REGULATIONS. THEY ARE INTENDED AS A GUIDE FOR THE CONDUCT OF THE SPORT AND IN NO WAY ARE A GUARANTEE AGAINST INJURY OR DEATH TO PARTICIPANTS, SPECTATORS OR OTHERS.

References are made throughout these regulations requiring and/or recommending that particular products meet certain specifications. These products are manufactured to meet or exceed certain criteria and are labeled as such upon satisfying those criteria. Any change to these products voids that certification. Under no circumstances may any certified product be altered from the “as manufactured” condition or such certification is voided.

Changes and additions to the 2022 USRA B-Mod rules are underlined and highlighted in red. Changes made for grammatical purposes or to improve clarity are not highlighted. All participants and officials are expected and required to additionally be familiar with the definitions and detail s in the USRA General Rules, Regulations & Procedures.
The United States Racing Association shall hereafter be simply referred to as the USRA throughout the rules description. USRA official(s) shall include all personnel employed as an official by the participating racetrack.

USRA B-Mod Racing Rules shall apply at all events. All participants are subject to the rules of the USRA and are expected to know the rules. These rules are a guideline as to what is permitted and/or not allowed. If these rules do not explicitly say it is permitted, then you must contact the USRA to identify if the part in question is permitted for competition.

ARTICLE 1: BODY

1.1 Plastic and/or composite body panels are not allowed with the exception of the rear quarter panels and doors. Rear quarter and doors may be constructed from a fire retardant plastic or composite material under the USRA B-Mod Racing Rules.

1.2 An aluminum half-windshield may be used on driver’s side of the front window opening only.

1.3 Stock appearing front window support units must be used (painted roll bars are not acceptable substitutes). Front window may have a support of no more than twenty (20) inches at bottom, going straight up to top.

1.4 A minimum window opening of twelve (12) inches must be maintained on all four window openings (front, back, left and right).

1.5 Streamlining at top of windshield is not allowed. Bodies must have standard appearing windshield opening and corner post must follow standard configuration.

1.6 Original roof line of vehicle (parallel to deck, front to back and side to side) must be maintained with a maximum of five (5) inches of slope from rear to front. No more than one (1) inch stiffener permitted at the rear of the roof and must turn down perpendicular to the ground. A maximum one (1) inch roof lips on outside edge of roof are permitted. A maximum four (4) inch vertical sides on roof are permitted. Fiberglass roofs are permitted. Aluminum roofs are permitted but must remain flat and may not be concaved.

1.7 Sail panels must be solid and of matching design with matching styles on both sides of racecar. Sail panel may be no farther forward than the driver’s seat and no farther back than rear of decking and no higher than the roof. Sail panel must be mounted within one (1) inch of the outer edge of deck and flush with the outer edge of roof. Sail panels, side to side, may have no more than four (4) inches of variance in material length when measured from roof line to deck.

1.8 Sail panels may have no more than four (4) inch consistent bow from top to bottom. A maximum eighteen (18) inches of sail panel along the roof and maximum five (5) inches tall at rear of decking and must be a straight line from back edge of roof to back edge of deck when the sail panel is held flat. Leading edge must within two inches of 90 degrees from roof to quarter panel.

1.9 Hood may be no more than two (2) inches above decking and must be sealed off from driver. Reverse hood rake is not allowed. Hood must be level or slope forward toward nose of racecar. Lips on the hood are not allowed. Hood must be flat from side to side—bowed and/or concaved designs are not allowed.

1.10 Belly pans are not allowed. A belly pan will be defined as any object or material that alters the airflow under the racecar.

1.11 Panel(s) in front of the right door next to the engine compartment is/are not allowed. Panels under the deck area mounted horizontal or vertical are not allowed.

1.12 Bodies with excessive damage (as determined by an official) will not be allowed to compete.

1.13 Spoilers are not allowed under the USRA B-Mod Racing Rules.

1.14 The rear deck lid and/or trunk area must be covered. Deck height may be a maximum of thirty-nine (39) inches—NO TOLERANCE. Must have an access panel no smaller than six (6) inches wide and twelve (12) inches long in front of fuel cell in the deck to view pull bar location. Drop decks are not allowed. Deck may be a maximum length of one hundred twenty (120) inches from rear of engine. Deck must remain parallel to the frame and chassis and the same width from front to back and front of deck must be level to ground from side to side. Deck must remain within four inches of parallel to motor measured at rear of deck. (see measurement “W” in body diagram). Deck may not be concaved. Deck may have a maximum total slope of six (6) inches with a maximum of three (3) inches of slope from racing seat to rear of deck as measured from the ground. Doors and quarter panels must be flush with deck. Doors and quarter panels must be a minimum twenty-two (22) inches and a maximum thirty-six (36) inches in material length. Doors and quarter panels must remain outside of outside frame rails. Deck width may be a maximum of sixty-six (66) inches and must be the same from front to rear.

1.15 Maximum overall width of nose is forty-two (42) inches top and bottom. Nose must remain flat, parallel to the deck and may not be concaved. Two (2) inch nose fins are permitted along both sides of the nose. Nose fins may not pass the leading edge of radiator or continue past leading edge of hood. All aluminum of the nose (including the fins) must be completely inside the outer edges of the bumper. Nose fins must
match side to side. If it is between nose fins, it is the nose; if it separates from the hood, it is the nose. Maximum nose length is forty-two (42) inches as measured from center of lower ball joint—NO TOLERANCE.

1.16 Tires must remain the widest part of the racecar. No part of body may extend beyond the outside edge of the tires. Exception: The lower part of the left rear quarter panel’s wheel opening’s front edge may extend a maximum one inch outside the tire but wheel opening must remain no smaller then outside diameter of tire under the USRA B-Mod Racing Rules.

1.17 Excluding hood and nose piece, body may extend no further forward than the back of the engine block. Exception: Bottom of door may extend a maximum of eight (8) inches ahead of rear of block.

1.18 A maximum five (5) inch plastic skirt on bottom of doors and quarter panels and nose piece is permitted. Body must remain a minimum of three (3) inches from ground and nose must remain a minimum five (5) inches from the ground. Engine covers are not allowed. Fins, wings, lips or other air spoilers (other than noted) are not allowed. A maximum one-half (0.5) inch break for rigidity on body panels is permitted. Any approved lip(s) must be the same from side to side..

1.19 Bumpers:

1.19.1 Center of bumpers (front and rear) must be at least sixteen (16) inches from the ground and no more than twenty (20) inches from ground.

1.19.2 Both front and rear bumpers must be used and must not have any sharp edges. Any inappropriate bumper will be disallowed by an official. Front bumper must be mounted from frame-end to frame-end with the bottom loop parallel to ground. Bumpers must be made of a minimum of one and one-quarter (1.25) inch diameter tubing with a minimum wall thickness of sixty-five one-thousands (.065) inch and must be able to support the racecar if lifted by a tow vehicle. Top bar must be directly above bottom bar (not off-centered).

1.19.3 Rear bumpers and side rail bars must not extend beyond the width of the rear tires. Tires must be the widest part of body.

1.19.4 Rear bumpers may be constructed of tubing or flat stock and must protect the fuel cell under the USRA B-Mod Racing Rules.
1.19.5 Any aluminum of the nose may not extend outside of front bumper. Plastic valances and/or plastic nose pieces are permitted but no plastic may extend in front of the bumper. Plastic may flare past the sides of the bumper but all nose piece components must be a minimum of five (5) inches above the ground.

1.19.6 Front bumper may be a maximum width of forty-four (44) inches from outside to outside under the USRA B-Mod Racing Rules.

1.19.7 Bumper may be no farther forward than forty-two (42) inches as measured from the center of the lower ball joints.

1.20 Appearance:

1.20.1 All racecars must be numbered with large legible numbers on both sides, on top and on the nose and real panels. Numbers on the sides of the racecar should be in contrasting color from the body and be at least four (4) inches thick and at least eighteen (18) inches high. Top numbers should be at least four (4) inches thick and twenty-four (24) inches high.

1.20.2 Officials reserve the right, in the public image of the sport and/or the USRA, to assign, approve or disapprove any advertising, sponsorship or similar agreement in connection with any event. All cars must be neat appearing and are subject to approval of officials to compete. By competing in an event, all drivers agree to comply with the decisions of officials in this regard.

ARTICLE 2: ROLL CAGES

2.1 The main roll cage must consist of continuous hoops of round steel tubing and must be acceptable to officials. Acceptable tubing is as follows: minimum one and one-half (1.5) inches diameter by ninety-five one-thousandths (0.095) inch wall thickness for main four point roll cage. Any tubing measuring one and three-quarter (1.75) inches diameter will be permitted a minimum wall thickness of eighty-three one-thousandths (.083) inch. Any tubing under one and three-quarter (1.75) inches diameter will be required to be a minimum ninety-five one-thousandths (0.095) inch wall thickness tubing. Sliding and/or slip joint roll bar unions associated to the main roll cage are not allowed. A minimum of three (3) driver side door bars must be parallel to ground and located perpendicular to the driver to provide maximum protection
for the driver, but without causing undue difficulty in getting in or out of the racecar. Side bars must be welded to the front and the rear of the roll cage members. Driver side door bars and uprights must be at least one and one-half (1.5) inches in diameter at a minimum of eighty-three one- thousandths (0.083) of an inch wall thickness. Steel door plate, 18 gauge or forty-nine one-thousandths (0.049) inch minimum thickness, must be securely welded to outside of driver side door bars and cover area from top door bar to bottom door bar and from rear hoop down-post to five inches in front of seat. Passenger side must have at least one cross door bar, horizontal or angled, minimum one and one-quarter (1.25) inch O.D. with eighty-three one thousandths (0.083) inch wall thickness, and one top horizontal door bar, minimum one and one-half (1.5) inch O.D. with eighty-three one thousandths (0.083) inch wall thickness.

2.2 Roll bars within the driver’s reach must be padded with an accepted material as determined by an official. Fire retardant material is highly recommended.

2.3 Installation and workmanship must be acceptable to officials.

2.4 Must be frame-mounted in at least six (6) places under the USRA B-Mod Racing Rules.

2.5 Must consist of a configuration of front and rear hoops connected by tubing on the sides or side hoops meeting the minimum tubing dimensions listed in Rule 2.1.

2.6 With helmet on and driver securely strapped into the racing seat, top of driver’s head must not protrude above the roll cage. A cross bar in halo is required.

2.7 Must have a protective screen or bars in front window opening in front of driver’s face.

2.8 Protection of driver’s feet utilizing a bar across the back of the engine with vertical bars and rub rails or similar protection is mandatory.
2.9 Brace bars forward of roll cage may not be higher than the stock hood height.

2.10 Adjustable bars on the frame and/or roll cage are not allowed. Removable bars are permitted under the USRA B-Mod Racing Rules.

2.11 Roll cages not meeting these rules and regulations will be subject to cash fines and associated penalties.

ARTICLE 3: FRAME

3.1 Factory production complete full-perimeter 1960 or newer parallel American passenger car frames only. Frames may be cut in rear only at a point equal to or behind rear of engine.

3.2 May only be altered for the installation of springs and shocks. Top of frame may not be altered for upper “A” frame clearance.

3.3 All components must be made of steel and be properly welded under the USRA B-Mod Racing Rules.

3.4 Must be full and complete on both sides, may not be widened or narrowed and must be able to support roll cage on both sides. All factory holes must be present for inspection. All measurements must meet the frame diagram tolerances listed or be within one-half (0.5) inch (either way) of OEM measurements on any measurement not listed on frame diagram—NO TOLERANCE.

3.5 Minimum height from ground is four (4) inches. Exception: Front cross member may be notched for radiator clearance only. Outside frame rails may not be raised. (See measurement “L” on frame diagram)

3.6 Rear of frame may be altered to accept leaf or coil springs under the USRA B-Mod Racing Rules.

3.7 Hydraulic, ratchet or electric weight jacks are not allowed anywhere on the racecar. Aluminum jack bolts are not allowed.

3.8 Wheelbase must be a minimum of one-hundred eight (108) inches on both sides and a maximum of one-hundred twelve (112) inches on both sides (no tolerance).

3.9 Tubular front clips are not allowed.

3.10 Overall width of the racecar may not exceed seventy-eight (78) inches. Width shall be measured from the widest points on each side of the racecar (the tires).

3.11 Rear of engine (bell housing flange) must be mounted at least seventy-two (72) inches forward from the center line of the rear axle—NO TOLERANCE.

ARTICLE 4: COCKPIT, STEERING & SEAT

  • The vehicle must start under its own power and have both forward and reverse motion.
  • Normally aspirated engines, carbureted only under the USRA B-Mod Racing Rules.
  • May be a maximum of (360c.i.d for Chevy) (363c.i.d. for Ford) (368c.i.d for Dodge).
  • Crate option GM 19258602 CT350 GM-Sealed 602 Chevy Crate Engine.
  • Must be sealed under the USRA B-Mod Racing Rules.
  • All power train items to be located in their original position and locations under the USRA B-Mod Racing Rules.
  • ENGINE SET BACK, The centerline of the leading spark plug hole must be even with, or in front of, the centerline of the upper ball joint.

INTAKE TO OIL PAN, WATER PUMP TO REAR TRANMISSION WILL REMAIN STOCK IN NATURE

4.1 Loose objects and/or weights are not allowed.

4.2 Air bags are not allowed. Rear view mirrors are not allowed under the USRA B-Mod Racing Rules.

4.3 Other than the gas pedal, brake pedal and front-to-rear brake bias, any knobs, handles or levers used for adjustment of carburetor, ignition timing and/or suspension is not allowed.

4.4 Floor and firewall must be complete in the driver’s compartment. Minimum 0.125 inch aluminum, or 0.060 inch steel, complete floor pan required. .Interior sheet metal cannot be higher than or enclose a standard window opening. Sheet metal in the driver’s compartment must be horizontal from the top of the driver shaft tunnel to the right side door bars or angle from the top of the drive shaft tunnel upwards to the top of the right side door bars. Driver must be able to exit the racecar from both sides.

4.5 Steering:

4.5.1 Must be OEM and remain within original bolt pattern for type of frame used. Idler arm, pitman arm and center link must match frame. Outer tie rod end and adjustment sleeve may be replaced with a heim end and steel tube.

4.5.2 Rack and pinion is not allowed under the USRA B-Mod Racing Rules.

4.5.3 600 steering gear boxes are not allowed.

4.5.4 May be modified to suit driver but must remain on left side of cockpit (no center steering).

4.5.5 Quick-release metal coupling on steering wheel is mandatory. Plastic couplings are not allowed under the USRA B-Mod Racing Rules.

4.6 Seat:

4.6.1 Factory-manufactured racing seats are mandatory and must be acceptable to officials.

4.6.2 Homemade aluminum, plastic or fiberglass seats are not allowed under the USRA B-Mod Racing Rules.

4.6.3 Must be installed with minimum three-eighth (3/8)-inch fasteners and washers and seat back may not be moved back further than rear edge of quarter post.

4.6.4 High-back aluminum seats only. Full containment racing seats are strongly recommended under the USRA B-Mod Racing Rules.

ARTICLE 5: SUSPENSION

5.1 Front suspension must remain stock-type for the type of frame being used. Lower A frame must be unaltered stock stamped steel and in OEM location and remain OEM dimensions with OEM type bushings only. Mono ball or heim style bushings are not allowed. One-piece steel, rubber, polyurethane or nylon bushings only No offset or bearing type bushings allowed. Inner steel sleeve in bushing must be present. Screw-in ball joints are permitted. GM 1978-1988 metric “G” body frames are allowed to use Nova lower “A” frames. Front and/or rear suspension travel limiting devices are not allowed except for tether chains (see Rule

5.10 Front and/or rear suspension must travel freely in both directions from ride height measured at the shock.

5.2 Aluminum and/or titanium components are not allowed. Magnet must stick to all components Exception: aluminum cross shafts are permitted. Stainless steel is permitted. Gun-drilled, tubular and/or hollow bolts or studs are not allowed anywhere on the racecar under the USRA B-Mod Racing Rules.

5.3 Steel tube-type upper A-frames are permitted and may be moved but pivot points must remain on the top of the frame rail.

5.4 Stock unaltered passenger car spindles only, must match side to side make and dimensions. Fabricated spindles and/or steering arms are not allowed under the USRA B-Mod Racing Rules.

5.5 Front sway bars may be used. Must be made of steel and may be attached to the bottom A-frame using steel Heim joints. Must be solid full-length OEM.

5.6 A solid rear Panhard bar or solid J-bar may be used. J-bar must be mounted to right side of pinion and go over the top of the driveshaft to left side of the chassis. Must be made of steel and may be attached by using a minimum three-quarter (0.75) inch i.d. steel Heim joint. Minimum length must be nineteen (19) inches measured from center of Heim to center of Heim.

5.7 Two-link suspension only. Four-link type suspensions are not allowed. All suspension bars and/or arms must remain solid and straight, a minimum fifteen (15) inches from center of Heim and must mount on the bottom side of rear end housing. Swing arms are not allowed. Solid pull bars only and centerline of pull bar must be mounted above driveshaft and within one (1) inch of driveshaft centerline. Lift arm is not allowed.

5.8 Suspension or rear-end parts, including jack bolts and mounting brackets, must be made of steel. Spring and suspension covers are not allowed. Tarps and/or covers on racecar are not allowed in tech area.

5.9 Floating suspensions are not allowed. All bird cages and/or brackets must be welded to the rearnend housing under the USRA B-Mod Racing Rules.

5.10 A tether chain is permitted on front and rear suspension. Chain must be mounted from lower A-frame to frame or cage on front end and on top of axle tube to frame or cage on rear end. Chains must be mounted vertical and solid and must remain loose at ride height. Only left side rear chain may utilize a rubber biscuit. Springs of any kind are not allowed on chains. Frame or cage rear end travel stops are not allowed (Exception: under slung chassis and tether chains).

5.11 Shocks & Springs:

5.11.1 One (1) shock per wheel is permitted and rear shocks must be mounted within twenty-five (25) degrees of vertical. Only conventional type (closed on one end) single shaft shocks are permitted. Rear end dampener shocks are not allowed. Rear shocks may be mounted on a weight-jack-type adjustable bolt.

5.11.2 Shock shaft must be able to compress all the way into shock body. Shock shaft must move in both directions from its installed position at ride height. Shock cannot preload the spring.

5.11.3 Shock covers are permitted but may cover only front half of shock and must be mounted directly to shock. Bump stops (internal or external) are not allowed. Shock rubber stoppers are not allowed under the USRA B-Mod Racing Rules.

5.11.4 Steel shock mounting bolts only. Aluminum and/or titanium is not allowed under the USRA B-Mod Racing Rules.

5.11.5 Bladder-type and/or Schrader valves are not allowed. Coil-over, remote and/or air reservoir shocks are not allowed. Canister and/or adjustable shocks are not allowed. Bulb-type shocks are not allowed. Air shocks are not allowed. Aluminum shocks are not allowed. Inerter shocks, J-damper shocks, active mass damper shocks and/or through-rod-designed shocks are not allowed. Dummy shocks are not allowed. Aluminum shaft guides are permitted.

5.11.6 Shocks shall be subject to claim, as outlined in Claim Procedures (see Article 16).

5.11.7 One spring slider on each rear wheel is permitted. Coil springs must be at least four and one-half (4.5) inches outside diameter. Steel springs only. Torsion bars are not allowed in rear. Spring rubbers are not allowed. Progressive, tapered, stacked and/or welded springs are not allowed under the USRA B-Mod Racing Rules.

5.11.8 Leaf Spring Rule: Must use steel, multi-leaf springs. Must be same number of full springs on each side (half springs are not allowed). Additional suspension components are not allowed. Adjustable lowering blocks are permitted.

5.11.9 Mono-Leaf Spring Rule: Must utilize coil springs centered on top of rear-end housing.

5.11.10 Must adhere to either Leaf Spring Rule or Mono-Leaf Rule. Mixing and matching is not allowed under the USRA B-Mod Racing Rules.

ARTICLE 6: ELECTRICAL SYSTEM

6.1 Battery:

6.1.1 Must be securely mounted inside frame rails and covered.

6.1.2 One (1) 12-volt battery only (no 16-volt batteries).

6.1.3 Voltage converters are not allowed.

6.1.4 All battery posts must be securely covered.

6.2 Ignition:

6.2.1 Must utilize OEM distributor and ignition. Stock-appearing coils, coil covers and modules only. Square coil covers are not allowed. Multiple spark ignitions are not allowed. Crank trigger ignitions are not allowed. GM external coils are not allowed. All ignition parts must remain out of the reach of the driver.

6.2.2 Kill switch required within easy reach of the driver. The switch must be clearly marked “OFF” and “ON.”

6.2.3 GM must utilize OEM GM HEI distributor. Chrysler and Ford may use aftermarket HEI (bushing type only). Roller bearings are not allowed. Must utilize stock-type components.

6.2.4 Open circuit board modules are not allowed under the USRA B-Mod Racing Rules.

6.3 Digital gauges are not allowed. Digital tachometers are permitted. Cameras pointing to any moving parts, suspension parts and/or gauges are not allowed. Except for memory recall tachometer, electronic monitoring computer devices capable of storing and/or transmitting information are not allowed under the USRA B-Mod Racing Rules.

6.4 Wiring elements must be accessible for technical inspection. Any racecar advancing spots and missing will be subject to disqualification under the USRA B-Mod Racing Rules.

6.5 All standard engines (see Rule 13.7) must utilize a soft-touch rev control box MSD part #8727CT with a 7,000 RPM maximum limit. All crate engines (see Rule 13.6) must utilize a soft-touch rev control box MSD part #8727CT with a 6200 RPM maximum limit. All concept engines (see rule 13.8) must utilize a soft-touch rev control box MSD part #8727CT with a 6500 RPM maximum limit. This must be out of reach of the driver but easily accessible for inspection at all times. A lexan window above ignition box for easy viewing of the rev limiter is highly recommended. MSD part #8727CT rev control box is required with unaltered wiring harness and will be required on all race cars. Ground wire must be visible for inspection and it is recommended that it be mounted near or on the distributor. Any driver deemed to have altered the rev limiter and/or ignition system in any way to defeat the rev limiter rule shall receive a minimum 30-day suspension, loss of all track, regional and national points for the night and a $1,000 fine for the first offense. Second offense shall be a minimum one (1)-year suspension, loss of all track, regional and national points for the year and a $2,000 fine.
6.6 Transponders must be mounted vertically on or behind engine mid-plate, less than two (2) feet from the ground and unobstructed by any metal.

ARTICLE 7: FUEL SYSTEM

7.1 Fuel:

7.1.1 Automotive gasoline, racing gasoline is permitted. Oxygenated fuel is not allowed; however an ethanol blend is allowed up to 85%. Additives of any kind are not allowed. Penalty for illegal fuel is loss of points, cash and awards earned for that event and subject to a fine.

7.1.2 May not be blended with ethers or other oxygenates and may not be blended with aniline or its derivatives, nitro compounds or other nitro containing compounds. Fuel is tested and must pass using a Digitron dielectric meter. It is the responsibility of the driver and/or owner to have fuel tested.

7.1.3 Upper cylinder lubricants are not allowed under the USRA B-Mod Racing Rules.

7.2 Electric fuel pumps are not allowed. Belt driven fuel pumps are not allowed. Pumps must bolt to block in stock location.

7.3 Carburetor:

7.3.1 Must be naturally aspirated.

7.3.2 Fuel injection is not allowed. Aerosol carburetors are not allowed under the USRA B-Mod Racing Rules.

7.3.3 The Standard Engine must utilize a gauge-legal, unaltered Holley (or Holley-type) 500 CFM two-barrel (part #4412). HP and/or XP carburetors are not allowed. Aftermarket metering blocks are permitted. Grinding and/or polishing of any kind is not allowed. All carburetor components must be for a Holley 500. Milling and/or grinding of throttle shaft is not allowed, and shaft must stay round. The choke and air horn may be removed (this is the only reworking permitted). Casting line at venturi must be present. Boosters must remain centered in venturi and may not be raised or lowered. Annular discharge boosters are not allowed.

7.3.4 Crate engines and concept engines are permitted to use a Holley 4150 Series four-barrel carburetor. HP carburetors are permitted. This carburetor has no size requirements but must remain to function as the 4150 series carburetor was designed and must utilize Holley type boosters. Vacuum secondary carburetors are not allowed. Annular discharge boosters are not allowed.

7.3.5 A one (1) inch adapter plate or spacer is permitted. Distance between bottom of carburetor and top of intake manifold cannot exceed one and one-quarter (1.25) inch. Spacer thickness must remain the same front to back and side to side.

7.3.6 Carburetors shall be subject to claim, as outlined in Claiming Procedures (see Article 16).

7.4 Fuel Cell:

7.4.1 Must be commercially manufactured and must be mounted utilizing at least two (2) steel straps. Straps must be two (2) inches wide at all measuring points.

7.4.2 Must be enclosed in a steel container and must be protected in rear of axle by roll cage tubing mounted securely.

7.4.3 No part may be lower than protective tubing. Protective tubing must be no wider than six (6) inches on both sides. Fuel cell may be no lower than ten (10) inches from the ground.

7.4.4 Must have check valves. A ball-type, flapper or spring or filler rollover valve is mandatory for fuel cells without a positive seal filler neck/cap system.

7.4.5 Limited to a maximum capacity of thirty-two (32) gallons.

ARTICLE 8: TIRES & WHEELS

8.1 Wheels:

8.1.1 Must be fifteen (15) inches in diameter and eight (8) inches in width.

8.1.2 Bleeder valves are not allowed under the USRA B-Mod Racing Rules.

8.1.3 Must be reinforced steel only.

8.1.4 A steel bead lock may be used on the right side wheels only and may be mounted on the outside of the wheel so long as it does not add to the overall width of the wheel.

8.1.5 Homemade mud caps are not allowed under the USRA B-Mod Racing Rules.

8.1.6 Wheel covers are permitted on right side wheels only. Inner mud plugs are permitted.

8.1.7 Wide five wheel adaptors are not allowed. Steel lug nuts only are permitted.

8.1.8 Spacer between hub and wheel is permitted but must be made of aluminum only and overall width of racecar cannot exceed seventy-eight (78 inches measured from the top of left tire to the bottom of the right tire (at widest part).

8.1.9 Added ballast to any wheel is not allowed.

8.1.10 Solid and/or non-spoked wheels are not allowed under the USRA B-Mod Racing Rules.

8.2 Tires:

8.2.1 The only tire permitted is the American Racer G60-15 KK704 (Short, Tall or X Tall). Tires must durometer 50 or harder at the conclusion of any race. Any tire not meeting this durometer reading is subject to having a tire sample sent in for chemical testing.

8.2.2 Softening is not allowed. Solvents of any kind are not allowed. Altering tires with any components or chemicals which alter the manufacturer’s baseline-settings of the tire is not allowed.

8.2.3 Grooving and/or siping is permitted under the USRA B-Mod Racing Rules.

8.2.4 Sidewall markings must remain visible. Buffing and/or removing compound designations is not allowed under the USRA B-Mod Racing Rules.

8.2.5 Added ballast to the inside of any tire is not allowed under the USRA B-Mod Racing Rules.

8.3 Tire Testing Procedures:

8.3.1 Random GC (gas chromatography) scans may be performed to identify illegal substances. A GC scan should always be a peak in 19-20 minutes. If there is no peak, the driver will be disqualified. Driver may protest the GC scan results and request a mass spec test at the cost to the driver (usually around $300). The mass spec test will reveal exactly what substance was used. The main peak of the tire should never be in half.

8.3.2 Traces of chemicals and/or excessive quantities of chemicals found to be outside the baseline on any test is automatic disqualification. First offense shall result in loss of all points accumulated for the season, forfeiture of all prize money earned for the event, up to a $5,000 fine and an indefinite suspension from USRA-sanctioned events. Driver will not be permitted to compete in any future USRA-sanctioned event until fine is paid in full.

8.3.3 It is strongly recommended that all drivers use only soap and water. Baking tires will not eliminate traces of illegal substances. The USRA will aggressively test for illegal substances and will levy severe punishment for infractions.

ARTICLE 9: BRAKING SYSTEM

9.1 Must be operating on all four wheels and must lock up all four wheels during inspection.

9.2 Must have caliper and rotor on all four wheels. Caliper and rotor must be standard size and weight. Vented rotors are required on front and rear wheels.

9.3 Electronic brake actuators are not allowed. Brake shut-offs are not allowed under the USRA B-Mod Racing Rules.

9.4 Calipers may not be lightened, must be OEM, made of steel and must match front to front and rear to rear. Brake pads may not be altered or lightened and must match side to side.

9.5 Rotors must be steel and may not be lightened, scalloped, slotted or drilled. Rotors may be re-drilled for different bolt patterns or larger studs. Oil bath hubs are not allowed.

9.6 Front-to-rear brake bias is permitted (no left to right).

9.7 Brake floaters are not allowed under the USRA B-Mod Racing Rules.

9.8 Brake lines must be visible.

9.9 Must maintain minimum OEM dimension for hubs, rotors, pads and calipers.

ARTICLE 10: DRIVE SHAFT

10.1 A loop is required and must be constructed of at least one-quarter (0.25) inch by two (2) inches solid steel. Loop must be mounted no more than six (6) inches from the front of the drive shaft tube. Alternatively, two (2) loops of one-quarter (0.25) inch by one (1) inch solid steel fastened to cross member are permitted.

10.2 Must be a minimum two (2) inches in diameter.

10.3 Must be painted white.

10.4 Aluminum drive shafts are not allowed under the USRA B-Mod Racing Rules.

10.5 Carbon fiber drive shafts are permitted but must be painted white.

ARTICLE 11: TRANSMISSION

11.1 OEM three-speed, four-speed and five-speed and automatic production-types are permitted. With engine running and racecar in stationary position, driver must be able to engage racecar in gear and then move forward and then backward at time of inspection.

11.2 “In and out” boxes are not allowed. Ball spline transmissions are not allowed under the USRA B-Mod Racing Rules.

11.3 May all be clutch-operated or an OEM automatic with a coupler. May use a hand or clutch pedal operated ball valve for neutral.

11.4 Aftermarket transmissions are permitted. Approved aftermarket transmissions are Bert (Part #LMZ/GEN II), Brinn (Part #70001), Brinn Predator (Part #70600), Falcon (Part #60100) and RaceGator (Part #140002/140002-C), Jerico (Part# JER0021) and Mitchell Machine Bullet Tranny with internal clutch. Ball Spline transmissions are not allowed.

11.5 Clutch must be inside of bell housing for OEM production-type transmissions (except as noted in Rule 11.4).

11.6 Starter must bolt to engine block or factory location.

11.7 One (1) forward gear and one (1) reverse gear must be in working order, plus a neutral position, and must be able to be shifted by driver.

11.8 Aluminum flywheel is permitted. Must have full-sized explosion proof, aluminum or steel bell housing. Aluminum must be SFI approved (Note: GM bell housing is not SFI approved). Flywheel must bolt to crankshaft. Clutch must bolt to flywheel, a minimum six and one-quarter (6.25) inch clutch.

11.9 Must have approved scatter shield or blanket. Scatter shield may be constructed of one-eighth (0.125) inch by three (3) inch steel, two-hundred seventy (270) degrees around flex plate or flywheel. Alternatively, automatic and/or aftermarket transmissions may utilize an SFI-certified aftermarket guard. Flex plates must be SFI certified.

11.11 Internal clutches are not allowed except for approved aftermarket transmissions.

ARTICLE 12: REAREND

12.1 Any passenger car- or truck-type is permitted. Aluminum is not allowed except lowering blocks, axle cap, U-joint caps and drive plate.

12.2 Nine (9) inch Ford rearend is permitted (floater recommended).

12.3 Quick change rearend is permitted with steel axles and steel axle tubes only. Must use a ten (10) inch ring gear and minimum one (1) inch wide solid spur gears.

12.4 Cambered rearends are not allowed (one-piece drive flange only).

12.5 Traction devices are not allowed (includes Gold Track, True Track or similar type components).

12.6 Rear of engine (bell housing flange) must be mounted at least seventy-two (72) inches forward from the center line of the rear axle—NO TOLERANCE.

12.7 Frame- or cage-mounted, forward and/or backward rearend travel stops are not allowed.

ARTICLE 13: ENGINE

13.1 Overflow tubes must be directed toward the ground and inside the frame rails under the USRA B-Mod Racing Rules.

13.2 Radiator must be mounted in front of engine. Aluminum pulleys and radiators are permitted under the USRA B-Mod Racing Rules.

13.3 All belt driven components must be mounted on front of engine. Electric water pumps and/or fans are not allowed. Engine oil coolers are not allowed. Air pumps are not allowed.

13.4 Offset must be within two (2) inches of centerline of front cross member under the USRA B-Mod Racing Rules.

13.5 Must be a minimum of eleven (11) inches from ground to front center of crankshaft under the USRA B-Mod Racing Rules.

13.4 Exhaust & Mufflers:

13.4.1 Tri-Y headers are not allowed. Round tube headers only. All primary tubes must enter one collector at the same point. Concept Engines must utilize non-stepped headers only. Standard Engines and Crate Engines may utilize stepped headers. Header wrap is not allowed under the USRA B-Mod Racing Rules.

13.4.2 Exhaust system and/or mufflers must be mounted in such a way as to direct spent gases away from the cockpit and away from areas of possible fuel spillage. Exhaust through body panels or fenders is not allowed.

13.4.3 Mufflers are recommended. Mufflers may be required at track’s discretion under the USRA B-Mod Racing Rules.

13.4.4 Exhaust sensors, merge collectors, dividing collectors, venturi collectors and/or extension cones are not allowed. Collector extension and/or muffler and turn down may not exceed twenty-four (24) inches and must maintain a consistent inside diameter.

13.4.5 Zoomies, Crossovers and/or 180s are not allowed under the USRA B-Mod Racing Rules.

13.4.6 Oil pan evac systems are permitted but must enter exhaust header from the side of the collector only. External pump systems are not allowed.

13.6 OPTION #1 – Crate Engine:

13.6.1 GM Performance Parts (GPP) factory-sealed CT350 Chevy small block crate engine (Part No. 88958602 or 19258602): includes four-bolt-main block, 9.5:1 hypereutectic pistons, cast iron crankshaft, GM iron Vortec cylinder heads, high-rise dual-plane intake manifold, 8-quart single kick-out circle track oil pan, valve cover kit with breather tube and breather, unique dual-pattern cam and special “kool nut” rocker arm nut design.

13.6.2 May utilize one (1) Holley 4150 Series four-barrel carburetor (see Article 7.3.4). Use of a spacer between carburetor and intake is optional, but spacer may be no more than one (1) inch thick and may not be throttle bore adjustable. Aerosol carburetors are not permitted. Carburetors shall be subject to claim (crate to crate only) as outlined in Claim Procedures (see Article 16).

13.6.3 Must utilize soft-touch rev control box with a 6,200 RPM limit. This must be out of reach of the driver but easily accessible for inspection at all times. Any driver caught altering the chip or ignition system in any way so as to defeat the chip rule shall receive a 30-day suspension, loss of all track and national points for the night and a $1,000 fine for the first offense. Second offense shall be a one-year suspension, loss of all track and national points for the season and a $2,000 fine.

13.6.4 Crate Engine is not subject to claim but must have a prominently displayed “Crate” decal affixed near the A pillar or Crate Engine is claimable. Any driver running a “Standard” engine with a “Crate” decal will be disqualified. Any driver running with a Crate Engine will not be eligible to claim in that season. Any driver that claims a Standard Engine and switches to Crate Engine will be eligible to be claimed.

13.6.5 Must be unaltered and sealed from factory at appropriate points (intake, head, timing chain cover and oil pan) with approved GPP break-off bolts. Any altered, damaged or missing GPP break-off bolts will result in driver being disqualified from that event, loss of all track and national points accumulated up to, and including, the date of the offense, and a $2,000 fine and fourteen (14) day suspension from all USRA-sanctioned events. Second offense carries a $5,000 fine and one (1) year suspension.

13.6.6 GM seal bolt exception is USRA, USMTS or approved rebuild seals (call 515-835-9946 for verification).

13.6.7 Crate Engine is not subject to claim.

13.7 OPTION #2 – Standard Engine:

13.7.1 Must be stock appearing. Any American make is permitted. Absolutely no changes allowed. Must use stock firing order for that make and model (GM to GM, Ford to Ford, etc.). Titanium is not allowed.

13.7.2 May be a maximum of 360 cubic inches. (370 c.i. for Chrysler).

13.7.3 Must be a maximum 9.5:1 compression. Only flat top or dished pistons are permitted under the USRA B-Mod Racing Rules.

13.7.4 Must appear strictly stock for that model and make and in the original mounts. Parts for 400 cubic-inch or larger engines are not allowed. Stroke must match block. Approved aftermarket blocks are permitted. Approved aftermarket blocks include DART #31161111 or Brodix #BRS400035842 or GM #12480047 or World Products #084010.

13.7.5 Only stock appearing crankshafts are permitted. Lightweight cranks are not allowed. No undercut, bull nosed, gun drilled or knife edge crankshafts allowed under the USRA B-Mod Racing Rules.

13.7.6 Lightweight, aluminum and/or fluid dampeners are not allowed under the USRA B-Mod Racing Rules.

13.7.7 GM five and seven-tenths (5.7) inch or six (6) inch rods are permitted. Must be stock appearing I-beam non-polished rod. Only standard size rod journals and wrist pins (Chevrolet rods 2.100/.927) are permitted. Aluminum and/or light weight is not allowed. Cap screw rods are permitted under the USRA B-Mod Racing Rules.

13.7.8 A minimum one (1) inch plug above the oil level in the side of the oil pan is recommended. If not utilizing a one (1) inch plug, oil pan may have to be removed at time of inspection under the USRA B-Mod Racing Rules.

13.7.9 Only stock, unaltered two-barrel low rise cast iron intake manifolds or Approved aluminum intakes are permitted. Approved aluminum intakes are GM - Edelbrock (#2101 or #2701) or Weiand (#7547 or #7547-1); Ford - Edelbrock (#2121 or #2181 or #2665) or Weiand (#7515 or #8023 or #7516); Chrysler – Edelbrock (#2176) or Weiand (#7545 or #8022). Porting, polishing or port machining is not allowed. Bowtie, aftermarket, SVO and W2, marine, VORTEC or other special production intake manifolds are not allowed. External cooler lines from back of intake to front of intake is permitted under the USRA B-Mod Racing Rules.

13.7.10 Cast iron stock production or aftermarket steel stock replacement heads are permitted. Porting, polishing and/or powder coating is not allowed. GM cars must utilize 76cc heads (approved head numbers are 336, 339, 388, 441, 454, 487, 624, 813, 882, 991 and 993). Aftermarket head numbers are GM – EQ Part #CC167ES2 or #CH350I; Dart Part #10024267 or #10024360; World Products Part #043600 or #042670; Ford – World Products Part #53030; Chrysler – EQ Part #CH318B; RHS/Indy Part #20300 or #20301. Heads may be flat milled to reach the 9.5:1 compression rule. Valve size no larger than 2.02 intake and 1.60 exhaust. VORTEC heads are not allowed. Beehive valve springs are not allowed.

13.7.11 Screw-in studs, guide plates and poly-locks are permitted under the USRA B-Mod Racing Rules.

13.7.12 Valve spring seat pressure may not exceed 130 pounds and open pressure may not exceed three hundred fifty (350) pounds—NO TOLERANCE. Roller cams and lifters are not allowed. Steel or aluminum stock ratio full roller rocker arms are permitted if the valve spring rule is utilized. Stock-type stamped steel rocker arms or cast stamped steel rocker arms are required if the valve spring rule is not utilized. Roller tip rocker arms are permitted with any valve spring. Any diameter valve spring is permitted. Beehive valve springs are not allowed. Chryslers may utilize OEM steel shaft rockers but may not exceed one hundred twenty (120) pounds of valve spring seat pressure and must maintain OEM valve spring dimensions. Under valve cover pressurized valve train oiling systems are not allowed under the USRA B-Mod Racing Rules.

13.7.13 Mushroom lifters are not allowed (stock diameter only). Must match make and model under the USRA B-Mod Racing Rules.

13.7.14 Stud girdles are not allowed under the USRA B-Mod Racing Rules.

13.7.15 Must utilize a rev limiter with a maximum setting of 7,000 RPM (See Rule 6.5).

13.8 OPTION #3 – Concept Engine:

13.8.1 Must be stock appearing. Any American make is permitted. Absolutely no changes allowed. Must use stock firing order for that make and model (GM to GM, Ford to Ford, etc.). Titanium is not allowed.

13.8.2 May be a maximum of 360 cubic inches. (370 c.i. for Chrysler).

13.8.3 Must be a maximum 9.5:1 compression. Only standard weight (minimum 450 grams) flat top or dished pistons are permitted. Must use standard weight wrist pins (minimum 130 grams). Must use minimum 1.5mm, 1.5mm, 3mm piston rings. Maximum six one hundredths (.06) inch oversized allowed under the USRA B-Mod Racing Rules.

13.8.4 Aftermarket and splayed main cap blocks are not allowed. Grinding, polishing, painting or coating of internal engine parts are not allowed. Altering lifter bores are not allowed. Lifter bore valley vent tubes are
not allowed. Block casting number must remain visible. Approved aftermarket blocks are permitted. Approved aftermarket blocks include DART #31161111 or Brodix #BRS400035842 or GM #12480047 or World Products #084010.

13.8.5 Only stock appearing crankshafts are permitted. Lightweight cranks are not allowed. No undercut, bull nosed, gun drilled or knife edge crankshafts allowed. Balancing permitted by drilling only. Resizing journals to a maximum .030 inch under is permitted. Stroke must match block.

13.8.6 Lightweight, aluminum and/or fluid dampeners are not allowed. Any stock OEM steel balancer is permitted under the USRA B-Mod Racing Rules.

13.8.7 Must be stock appearing I-beam non-polished connecting rod. Aluminum or light weight is not allowed. GM five and seven-tenths (5.7) inches or six (6) inches rods are permitted. Only standard size rod journals and wrist pins (Chevrolet rods 2.100/.927) are permitted. Cap screw rods are permitted. Minimum weight of 530 grams is required under the USRA B-Mod Racing Rules.

13.8.8 Steel oil pans only with a minimum one (1) inch plug above the oil level in the side of the oil pan. If not utilizing a one (1) inch plug, oil pan may have to be removed for inspection. Wet sump oil systems only.

13.8.9 Only stock, unaltered two-barrel low rise cast iron intake manifolds or Approved aluminum intakes are permitted. Approved aluminum intakes are GM - Edelbrock (#2101 or #2701) or Weiand (#7547 or #7547-1); Ford - Edelbrock (#2121 or #2181 or #2665) or Weiand (#7515 or #8023 or #7516); Chrysler – Edelbrock (#2176) or Weiand (#7545 or #8022). Porting, polishing, powder coating and/or port machining is not allowed. Bowtie, aftermarket, SVO and W2, marine, VORTEC or other special production intake manifolds are not allowed. External cooler lines from back of intake to front of intake is permitted under the USRA B-Mod Racing Rules.

13.8.10 Cast iron stock production or aftermarket steel stock replacement heads are permitted. Porting and/or polishing is not allowed. GM cars must utilize 76cc heads (approved head numbers are 336, 339, 388, 441, 454, 487, 624, 813, 882, 991 and 993). Aftermarket head numbers are GM –EQ Part #CH350I; Dart Part #10024267 or #10024360; or World Products Part #043600 or #042670; Ford –World Products Part #53030; Chrysler –EQ Part #CH318B. Heads may be flat milled to reach the 9.5:1 compression rule. Valve size no larger than 2.02 intake and 1.60 exhaust. VORTEC heads are not allowed. Intake valves must weigh a minimum one hundred three (103) grams. Exhaust valves must weigh a minimum eighty seven (87) grams. Only stock diameter valve springs are permitted. Valve springs may not exceed a seat pressure of one hundred twenty (120) pounds. Beehive valve springs are not allowed. Only stock steel valve spring retainers permitted under the USRA B-Mod Racing Rules.

13.8.11 Screw-in studs, guide plates and poly-locks are permitted under the USRA B-Mod Racing Rules.

13.8.12 Roller cams and lifters are not allowed. Only flat tappet hydraulic camshafts with four-hundred fifty thousandths (0.450) inch maximum lift at the valve or three-hundred thousandths (0.300) inch lift at the camshaft are permitted. Full roller rocker arms are permitted. Stock-type stamped steel rocker arms or cast steel rocker arms with roller tips are permitted. Must maintain an OEM rocker arm ratio (1.5 for GM). Chryslers may utilize OEM steel shaft rockers but may not exceed one hundred twenty (120) pounds of valve spring seat pressure and must maintain OEM valve spring dimensions. Under valve cover pressurized valve train oiling systems are not allowed.

13.8.13 Mushroom lifters are not allowed. Steel stock diameter lifters only and lifter must collapse one-tenth (0.1) inch minimum under the USRA B-Mod Racing Rules.

13.8.14 Stud girdles are not allowed under the USRA B-Mod Racing Rules.

13.8.15 Any Holley 4150 Series four-barrel carburetor is permitted (see Article 7.3.4).

13.8.16 Only non-stepped headers are permitted. Must follow all header rules (See Rule 13.4).

13.8.17 Must utilize a rev limiter with a maximum setting of 6,500 RPM (See Rule 6.5).

13.8.18 Overall racecar weight must be a minimum two-thousand five hundred (2,500) pounds

13.8.19 Concept engines are not subject to claim but must have “Concept” decal prominently displayed and affixed near the A pillar or otherwise engine is claimable. Any driver utilizing a Concept Engine will not be eligible to claim in that season. Any driver that claims a Standard Engine and switches to Concept Engine is eligible to be claimed.

13.8.20 All USRA fuel rules apply.

ARTICLE 14: WEIGHT

14.1 The overall weight of the racecar shall be measured at the conclusion of an event with the driver in the cockpit, wearing complete racing apparel.

14.2 Overall weight of the racecar must be a minimum of two-thousand five hundred (2,500) pounds under the USRA B-Mod Racing Rules.

14.3 Ballast:

14.3.1 May not be mounted in cockpit, outside of body or hood area, or on any rotating or suspension parts. Weight must be mounted to the frame, roll cage or rearend housing only. Weight brackets for rear-end housing must be made of steel.

14.3.2 Must be securely mounted, painted white and clearly marked with the car number.

14.3.3 Must be attached with at least two (2) one-half (0.5) inch bolts with a maximum of one hundred (100) pounds per mounting. Any ballast weighing twenty-five (25) pounds or less may be mounted with one (1) one-half (0.5) inch bolt.

14.3.4 May not be attached to rear bumper under the USRA B-Mod Racing Rules.

ARTICLE 15: SAFETY

15.1 It is recommended that each racecar have built-in fire extinguishing equipment but cannot be of the dry powder type (must be Halon 1211 or equivalent).

15.2 Drivers should have in their pit area as part of their equipment, at all times, a fully charged dry chemical, Halon (or its equivalent) fire extinguisher. Ten- or thirteen-pound fire extinguishers are recommended.

15.3 Driver must wear required helmet, fire suit and five-point safety harness whenever the racecar is on the racetrack. This includes during track packing, warm ups, hot laps and races.

15.4 Helmets are mandatory and must be certified SA2015 or SA2020.

15.5 Helmet must accompany driver and racecar at time of inspection under the USRA B-Mod Racing Rules.

15.6 Complete one- or two-piece fire suits of a flame retardant nature are mandatory under the USRA B-Mod Racing Rules.

15.7 Fire-resistant gloves and shoes are mandatory. Fire-resistant socks are recommended under the USRA B-Mod Racing Rules.

15.8 The use of a five- six- or seven-point driver restraint system (safety belts, sub-belt and shoulder harness) is required. Factory-type shoulder belts or straps are not allowed. The use of a seven-point driver restraint system is recommended.

15.9 Metal to metal buckles are required on shoulder and seat belts under the USRA B-Mod Racing Rules.

15.10 Shoulder harness must be mounted securely to the main roll cage under the USRA B-Mod Racing Rules.

15.11 Where the belt passes through the seat edges, a grommet must be installed, rolled and/or padded to prevent cutting of the belt.

15.12 Driver restraint system must be less than three (3) years of age past the date of manufacture. It is recommended that the driver restraint system be no more than two (2) years of age past the date of manufacture.

15.13 Full-size window net mounted in the left side driver’s window opening is required. Window net mounts must be welded to the roll cage. All bars around the driver must have approved roll bar padding. Approved racing arm restraints are recommended under the USRA B-Mod Racing Rules.

15.14 Fire-resistant safety neck collars are mandatory under the USRA B-Mod Racing Rules.

15.15 Absolutely no plastic except from edge of firewall to body skin and inner wheel tub to body skin.

ARTICLE 16: CLAIMING PROCEDURES

16.1 Any driver possessing a valid USRA license may have the opportunity to execute a claim on the cylinder heads and intake manifold, shocks or carburetor of another driver’s racecar. Crate Engines and Concept Engines are not claimable. Drivers utilizing a Crate Engine or Concept Engine are not eligible to claim another driver’s cylinder heads and intake manifold. Any driver running with a Crate Engine or Concept Engine will not be eligible to claim another driver’s cylinder heads and intake manifold in that season. Any driver that claims a standard engine and switches to a Crate Engine or Concept Engine will be eligible to have their cylinder heads and intake manifold claimed.

16.2 The first four (4) finishers in the main event must drive their racecars directly to the designated claim area at the conclusion of the main event and are subject to being claimed by any other driver that finishes fifth or lower and finishes on the same lap as the winner. Any of the top four finishers that do not go to the claim area will be disqualified but are still subject to being claimed.

16.3 Claims must be made within five (5) minutes of the completion of the main event. Claimed items must be removed at the racetrack and within one (1) hour after claimed driver accepts the claim.

16.4 Driver making claim must drive his/her race car immediately after finish of feature, under its own power, directly to the claim area.

16.5 Claiming driver must present license and cash to official overseeing the claim area at the time that the driver declares his/her intention to claim. The cash price of the claim for cylinder heads and intake manifold shall be $500. The cash price of the claim for carburetors shall be $300 or $150 and exchange. Only four-barrel for four-barrel and/or two-barrel for two-barrel claims are permitted. The cash price of the claim for shocks shall be $50 per shock. Drivers claiming shocks may claim one or more shocks during a single claim.

16.6 The cylinder heads and intake manifold claim includes both cylinder heads and intake manifold, rocker arm studs and guide plate, valves, valve springs, retainers and keepers, and intake bolts. This claim does not include carburetor spacer, valve covers, rocker arms, pushrods, thermostat and thermostat housing, any fittings, adapters, studs or head bolts.

16.7 Claiming driver shall select from the first four (4) finishers in the main event and must declare that choice to the official overseeing the claim area. If the claiming driver decides at that time that he/she does not wish to execute the claim, he/she will nonetheless be charged one claim. If multiple drivers declare an intention to claim, the driver finishing farthest back in the main event will select first. If the claimed driver is utilizing a non-claimable engine, the claiming driver may not choose another driver and will not be charged a claim.

16.8 Driver is permitted one (1) claim per event, regardless of the outcome of that claim.
16.9 Only drivers, car owners and officials are permitted in the designated claim area. Any other participants associated with that racecar that enter the claim area will be subject to disqualification, fine and/or suspension.

16.10 Only a driver may claim, and only the claimed driver or car owner may agree to accept or refuse the claim. The first statement of acceptance or rejection of the claim by the claimed driver or car owner is binding.

16.11 Any driver or car owner refusing to accept a claim will forfeit all cash and contingency winnings for that event under the USRA B-Mod Racing Rules.

16.12 Any driver or car owner refusing to accept a claim forfeits his/her right to make a claim in any USRA event for a period of one (1) year from the date of refusal.

16.13 Any driver or car owner refusing to accept a claim will forfeit all USRA points (national and track) accumulated up to, and including, the event at which the claim was made.

16.14 First refusal to accept a claim will result in that driver and car owner being suspended from all USRA events for thirty (30) days and until a $1,000 fine is paid and received at USRA headquarters. Second refusal to accept a claim will result in that driver and car owner being suspended from all USRA events for one (1) year and until a $5,000 fine is paid and received at USRA headquarters.

16.15 In the event of a dispute between driver and car owner whether to accept or refuse a claim, the decision of the driver shall overrule that of the car owner.

16.16 Any driver found to be making a claim for another person will lose all USRA points (national and track) accumulated to date for the entire season, all cash and contingency winnings for that event, and will be suspended from all USRA events for thirty (30) days and until a $1,000 fine is paid and received at USRA headquarters.

16.17 Sabotage of claimed parts will result in driver being suspended from all USRA events for fourteen (14) days and until a $1,000 fine is paid and received at USRA headquarters. Driver will also forfeit all USRA points (national and track) accumulated up to, and including, the event at which the sabotage occurred. Furthermore, driver will forfeit the privilege to make a claim for a period of one (1) year from the date on which the sabotage occurred.

16.18 Driver may claim a maximum of three (3) times during the calendar year.

16.19 After making an accepted claim, driver must finish in the top four (4) of a main event and reinstate his/her license. Cost is $25 for reinstatement of license. Driver will not be eligible to make another claim unless license is reinstated under the USRA B-Mod Racing Rules.

16.20 Cost for replacement of a lost license is $25 under the USRA B-Mod Racing Rules.

16.21 Driver must compete in a minimum of three (3) consecutive events prior to the event at which he/she makes a claim.

16.22 The USRA reserves the right to disallow any claim at their discretion under the USRA B-Mod Racing Rules.

16.23 Drivers utilizing a provisional starting position in the main event are not allowed to make a claim in that event under the USRA B-Mod Racing Rules.

16.24 At their discretion, officials reserve the option to claim the cylinder heads and intake manifold, shock or carburetor of any racecar.

16.25 Drivers will be eligible to make a claim during the first event of the season. After one event, driver must have raced in previous events before Rule 19.21 applies.

16.26 Disqualification shall not affect a legal claim. Claimed parts will be removed and transferred prior to any penalties being assessed. All involved claimed parts and related parts are subject to technical inspection and any illegal parts are subject to all fines and penalties but do not void the claim.

ARTICLE 17: LEGACY SPEEDWAY CONTINGENCY RULES

With prior approval from USRA, any sanctioned racetrack may utilize the option of sanctioning the B-Mod class using these ALTERNATIVE RULES. This is only an option for track promoters to use and it must be advertised and posted on their website if this option is utilized. This must be decided before the season starts but may be removed at any time. This is not an option for drivers to use from race to race. All race cars utilizing these Alternative Rules may utilize a maximum three (3) inch spoiler. All race cars not utilizing these Alternative Rules are not allowed any spoiler. All other USRA rules apply under the USRA B-Mod Racing Rules.

Body: An eight (8) inch rear filler panel must be utilized. Sail panels may be a maximum forty-three (43) inches long.

Rear suspension: A thirteen (13) inch maximum vertical rear spring centered on rearend housing with solid spring perches is required. A sixteen (16) inch minimum to nineteen (19) inch maximum rear suspension links and a twenty-three (23) inch minimum straight panhard bar mounted behind rearend housing is required. Rear shocks must be mounted behind rearend housing, Rear chains only, and if used must be mounted solid to axle housing and frame and must be loose at ride height.

Engine: Standard Engines and Crate Engines only (Concept Engines are not allowed). Stepped headers are not allowed. Maximum compression ratio of 9.0:1 with a maximum 6800 RPM rev limiter for Standard Engines. E85 fuel is not allowed. Cold air boxes are not allowed under the USRA B-Mod Racing Rules.

Rearend: Quick change rearends are not allowed. Full spools and/or lightweight gears are not allowed under the USRA B-Mod Racing Rules.

Transmission: Clutch less transmissions are not allowed (all gears must function).
Wheels: Only three (3) and four (4) inch offset wheels are permitted. One (1) inch wheel spacers on four (4) inch offset wheels are permitted. Any other wheel spacers are not allowed.

AMENDMENTS

NONE.

13.7.12 Valve spring seat pressure may not exceed 130 pounds and open pressure may not exceed three hundred fifty (350) pounds—NO TOLERANCE. Roller cams and lifters are not allowed. Steel or aluminum stock ratio full roller rocker arms are permitted if the valve spring rule is utilized. Stock-type stamped steel rocker arms or cast stamped steel rocker arms are required if the valve spring rule is not utilized. Roller tip rocker arms are permitted with any valve spring. Any diameter valve spring is permitted. Beehive valve springs are not allowed under the USRA B-Mod Racing Rules.

13.8.12 Only flat tappet hydraulic camshafts with four-hundred fifty thousandths (0.450) inch maximum lift at the valve or three-hundred thousandths (0.300) inch lift at the camshaft are permitted. Full roller rocker arms are permitted. Stock-type stamped steel rocker arms or cast steel rocker arms with roller tips are permitted under the USRA B-Mod Racing Rules.

 

United States Racing Association (USRA)
P.O. Box 905, Webster City, IA 50595
Office: 515-832-6000 | Fax: 515-832-7958 | usraracing.com
Darlo Mulder, Competition Director: 515-835-9946 | Email USRA