2026 USRA Stock Car Body Rules for Fabricators

Article 1: Body

Allowed cars: 1960-or-newer, U.S.-made, full-body passenger cars on a full frame or unibody. Panel vans and station wagons are not allowed.

• Aftermarket steel replacement bodies that copy the OEM body are allowed.
• Five Star Bodies MD3 Camaro kit (part #33131-10200) is allowed, but a car using it must weigh at least 2,950 lb total. Do not mix parts from this kit with OEM body parts.
• The body must keep its factory lines and shape. Front fenders must keep factory size and curve.
• Steel Chrysler 300 and steel Camaro fenders are allowed on G-body cars.
• Five Star Bodies aluminum lower front fenders (part #601-23A) are allowed. Other fabricated fenders are not.
• Fenders, doors, and quarter panels must keep their factory shape and arc. Flat-sided bodies are not allowed.
• The body must sit centered on the frame and parallel to it, front to rear and side to side.

• DST fix Typo Official text: OEM body's → Fixed: OEM bodies

Article 1: Body

Body panels must be steel OEM or OE-replacement panels, and must be steel all the way down to the frame.

• All pillars must be stock, steel, and in the stock location. Exception: the driver-side B-pillar may be moved for driver access.
• The roof must keep stock dimensions and slope. G-body cars may use an aftermarket fiberglass OEM-replacement roof.
• Five Star Bodies aluminum doors (part #601-21A) are allowed.
• Fabricated 1988 Monte Carlo front fenders, doors, and lower quarters are allowed only if they match the body-diagram measurements for this option, and only with the 1988 Monte Carlo nose and tail.

Article 1: Body

You may cut the body only to fit the roll cage or clear the tires.

Article 1: Body

Body panels must stay original size but may be gutted (inner structure removed). The body must mount in the stock location.

Article 1: Body

An official may refuse any car with excessive body damage.

Article 1: Body

If you put a newer front-wheel-drive body on an older chassis, the body must be square on the frame, not offset to the left.

Article 1: Body

Officials may assign, approve, or reject any advertising or sponsorship on a car to protect the image of the sport and the USRA. All cars must look neat and be approved by officials to race. By racing, you agree to follow officials' decisions on this.

Article 3: Frame

On GM cars, the stock frame must match the floor pan and firewall (same year and make). Steel OEM bodies only.

Article 13: Engine

Each bank's pipes must feed into one collector at least 4 in long. No exhaust through body panels or fenders.

Article 15: Safety

No plastic, except between the edge of the firewall and the body skin, and between the inner wheel tub and the body skin.

Article 1: Body

Hood:

• Aluminum hoods are allowed. The hood must be one piece and separate from the fenders. One-piece or tilt front ends are not allowed.
• A hole in the hood is allowed only for air cleaner clearance. It can be no larger than the air cleaner's diameter, and the air cleaner can stick up no more than 4 in above the hood.
• A shield or scoop up to 4 in tall, wrapping no more than 180 degrees around the air filter, may sit on the front side of the filter on top of the hood.
• The hood must be sealed to the cowl.

Article 1: Body

Nose, tail, and skirts:

• Stock-appearing plastic noses (max 74 in wide as installed) and tails are allowed.
• Door and quarter-panel skirts are allowed but must stay at least 4 in off the ground.
• Up to 3 in of skirting may be added to the nose and tail. The nose, including skirting, must stay at least 8 in off the ground.
• The back of the tail piece and the rear of the deck lid may be no more than 20 in above the center of the bumper and frame rails.

Article 1: Body

Spoilers and hood scoops are not allowed. (See 1.3 for the air-filter shield exception.)

Article 1: Body

Bumpers:

• Front and rear bumpers are required. No sharp edges.
• Tubular bumpers are allowed. They must be bent to fit, have rounded ends, and be covered by the molded plastic nose/tail.
• Bumpers must mount frame end to frame end.
• Bumper and frame center must be 16-21 in off the ground. No part of the bumper may be lower than 12 in.

Article 2: Roll Cages

Front and rear bars:

• Up to 2 bars may protect the radiator. They must be behind the front bumper, inside the body, and no wider than the stock frame horns.
• Front frame horns may be tied together.
• All front and rear bars must be inside the body.
• No adjustable bars on the frame or cage.

Article 14: Weight

Mount weight only to the frame, roll cage, or rear-end housing - never the rear bumper. Weight brackets on the rear-end housing must be steel.

Article 1: Body

Steel rub rails, max 1 in x 2 in, may run from front fender well to rear fender well and along the rear quarter panel. They must sit flush with the body.

• DST fix Typo Official text: may be attached to from fender well → Fixed: may be attached from fender well

Article 1: Body

Every car must have large, readable numbers on both sides, the roof, the nose, and the rear panels.

• Side numbers: contrasting color, at least 4 in thick (stroke width) and 18 in tall.
• Roof numbers: at least 4 in thick and 24 in tall.

• DST fix Typo Official text: nose and real panels → Fixed: nose and rear panels

Article 2: Roll Cages

Driver-side door plate: steel, at least 18-gauge (0.049 in), securely welded to the outside of the driver-side door bars. It must cover from the top door bar down to the rocker panel, and from the rear down post to 6 in ahead of the seat. It must be visible for inspection.

Article 1: Body

At least 3 windshield bars are required in front of the driver.

Article 1: Body

Visors and windows:

• A metal sun visor up to 7 in tall may be added at the top of the windshield opening. No other visors in door or side-window openings.
• Window openings must keep stock dimensions.
• The rear opera window may be covered with clear Lexan only, the same on both sides.

Article 1: Body

All glass must be removed.

Article 15: Safety

A full-size window net is required in the driver's window opening, with mounts welded to the cage. All bars around the driver must have approved padding. Approved arm restraints are recommended.

Article 1: Body

Trunk lids may not be concave. Trunk lids and quarter panels must slope down toward the rear of the car.

Article 7: Fuel System

Mount it securely in the trunk, above the stock trunk-floor level, with at least two solid steel straps (1/8 in thick x 2 in wide) around the cell.

Article 7: Fuel System

A firewall must separate the driver from the cell and run quarter panel to quarter panel.

Article 1: Body

Firewall and floor pan:

• Both may be removed but must be replaced with steel shaped like the factory floor pan.
• A fabricated steel floor pan may replace the OEM pan. It must be at least 18-gauge (0.049 in) steel, securely welded to the frame.
• The firewall may be flat, must be at least 24 in tall, and may be moved back no farther than the first factory frame seam (where the C-channel welds to the front stub) or 12 in behind the engine.

Article 4: Cockpit, Steering & Seat

Interior tin (optional):

• Sheet metal may run from the passenger door to no farther left than the left side of the driveshaft tunnel, and from the dash or firewall back to the rear of the seat.
• Height: no higher than the top of the door and no lower than the top of the top door bar. It must be level front to back and side to side.
• Exception: if the tin only runs from the top of the door to the right-side door bar, it may slope down to the door bar.
• Rear speaker-deck tin may run straight across, quarter panel to quarter panel, starting at the driver's seat (or the rear of the interior tin). It may not go past the C-pillar or past 99 in behind the engine, whichever comes first, and may not be higher than the deck lid and opera window.
• Everything behind that point must slope downhill to the back of the car.
• Penalty: if the speaker deck extends past the 99 in mark, you must add at least 25 lb of lead to the right-front cage hoop, ahead of the shock/spring, until it is fixed.
• If you build interior tin, the full firewall must stay, but the floor pan under the tin may be removed.

• DST fix Typo Official text: until repaired.. → Fixed: until repaired.
• DST fix Typo Official text: which ever → Fixed: whichever

Article 4: Cockpit, Steering & Seat

The dash may extend no more than 36 in behind the engine block. It must be flat and level, except for the cowl in front of the driver.

Article 4: Cockpit, Steering & Seat

Mount the seat with at least 3/8 in fasteners and washers. The seat back may be no more than 72 in behind the engine block.

Article 2: Roll Cages

Use a four-post cage made of continuous hoops. Front and rear hoops must be welded to the frame and be at least 47 in wide, measured outside to outside.

• DST fix Typo Official text: left-toright → Fixed: left-to-right

Article 2: Roll Cages

The rear hoop must have an X-brace. The front down bars must be tied together. Front and rear down bars must be at least 40 in apart, measured at the top of the door panel.

Article 2: Roll Cages

Cage dimensions:

• Back of engine to front edge of rear hoop: 76 in max.
• Top halo: at least 40 in wide (left to right) and at least 29 in long (front to back), outside to outside.

Article 3: Frame

Minimum wheelbase is 107.5 in on both sides, with no more than 1 in difference side to side. This applies to GM unibodies too.

• DST fix Typo Official text: GM unibody wheelbase repeated as a second sentence → Fixed: merged into one rule

Article 3: Frame

1980-or-newer Ford unibodies may be converted to a Ford full frame, which may be shortened to a minimum 111.5 in wheelbase.

Article 3: Frame

Ride height: the frame must be between 5 and 10 in off the ground, measured behind the front tires and ahead of the rear tires with the driver in the car.