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Bone Stock Full Size Rules

General Preparation

  • 77+ GMs, 79+ Fords, 80+ Chryslers.

  • Sedans or stations wagons are allowed. No T-tops, hearses, convertibles, or other exotic vehicles.

  • All interior plastic, upholstery, trim panels, etc must be removed. Nothing to remain in the bottom of the doors or trunk. This includes all carpet material. No broken glass inside of doors or other loose material anywhere inside the vehicle.

  • All outer hardware must be removed. (Example: All glass, door handles, mirrors, chrome, molding, fiberglass, etc.)

  • All flammable material must be removed.

  • ALL airbags must be completely removed. Un ugging/cutting airbag wires only not allowed!


  • The ECM/PCM can be relocated and secured. Securing engine computer may not strengthen vehicle in any fashion. Spray foam is okay to secure.

  • All seats except the driver's seat and the passenger seat must be removed from the vehicle. This includes all fold-down seats. Rear seats must be completely removed from the vehicle. Area where seats were removed must also be empty and clear of material.

Body Preparation

  • Trunk lids can be tucked 50% straight down into trunk area. Non-tucked section must remain on top of drip ledge of quarter panels and speaker deck and no further than 6" away from factory location.

  • Shaping trunk lid is allowed. Shaping/creasing of rear quarters is allowed but must remain at stock height. Absolutely no wedging trunk.

  • No tucking or beating down speaker deck on fresh cars. Trunk floor may be pushed up.

  • Notching rear frames is allowed. No welding or plating the notched areas.

  • Driver door can be completely welded shut. Other doors must be chained, seat-belted, or wired shut in

(6) spots maximum. Driver's door MUST be outlined with white paint.

  • Hood and trunk lid may be secured in maximum of (6) locations with #9 wire, seat belt, or 3/8" maximum chain. (2) tie-downs from hood and trunk lid each may be to the bumper.

  • Must have a 12" x 12" hole cut in hood. If you have it flapped, make sure a potential fire can be extinguished.

  • A 3/4" maximum size store-bought washer may be welded to sheet metal in each #9 wire location.

  • Changing the front (2) body bolts to the radiator core support allowed. They may be replaced with (1) piece of 3/4" maximum threaded rod and a 3" x 3" x 1/4" tube spacer each side. Core support spacer may be 3" tall maximum. Threaded rod may go through hood, but hood must still be opened for inspection. If using threaded rod through the hood, these count as (2) securing locations.

  • All body bolts may be changed with ¾” bolts through one side of the frame only.

  • Securing hood will be done directly once vehicle passes inspection. 4" x 1/4" maximum plate washer used on top side of hood at threaded rod locations, these may not be welded.

  • No adding body mounts. No other attaching body to frame. Absolutely no body welding other than specified in rules.



  • Aftermarket steering columns are allowed. No aftermarket hydraulic steering systems. 3/4" maximum steering column shafts allowed.

  • All suspension and steering must be stock to make/model you are running. No alteration to suspension or steering!


  • A-Arms must be OEM origin and bolt into place without alteration. No adding, altering, or welding brackets to mount A-Arms.

  • Sway bars may be manipulated but must bolt into factory holes with factory size mounting hardware. No adding holes or welding to suspension or frame to achieve this.

  • Coil springs may use wires or clamped into place. Leaf springs may use (2) OEM style clamps or single wrap of #9 wire to hold leaf pack together, (1) in front of axle, (1) behind axle.

  • Cars must have suspension bounce. Ride height measured from bottom of frame in front and back is maximum of 24", minimum of 14". Twist in coil spring spacers are allowed.



  • Vehicle must have working brakes at all times and have the ability to stop.

  • Any tire/rim combo is allowed.

  • (4) wheels max per vehicle, no dual tires.

  • No split rims or studded tires. No studded or liquid filled tires.

  • Wheel weights must be removed.

  • Tubes and outer tire flaps/skins are allowed.

  • Valve stem protectors are allowed but must be deemed safe.



  • All bumper rules apply for front and rear bumpers. There are (2) options for bumpers:

Option 1: Any year bumper is allowed but must be an automotive car bumper. Bumper ends may be cut off and capped with 1/8" steel OR ends folded around and

welded. Bumpers may also be seam welded, 1/2" weld bead maximum. Do not get excessive with welding!

Option 2: A 4" x 4" x 3/16" maximum tube may be used as a bumper. Ends must be cut off flush, not angled or sharp. Ends must be left open and not capped. Tube

bumpers may be no wider than 6" past outside edge of each frame rail at mounting position.

  • Absolutely no aftermarket, homemade, or loaded bumpers allowed. No capping holes in bumpers.

  • Bumpers may be welded on using a 4" x 4" x 1/4" maximum mounting plate flat onto the end of the frame OR by using the stock bumper shock that came with the vehicle, not both; 1/2" weld bead maximum.

  • (1) additional 4" x 6" x 1/4" maximum bumper plate per side is allowed. These plates must contact bumper and be used to attach bumper to frame. 1/2" weld bead maximum.

  • No other material or weld on bumpers or mounting other than described in rules! No sharp edges or protruding points. No other welding to frame anywhere is permitted!

  • Pre-Ran Vehicles Only: You will be allowed (2) 4" X 4" X 1/4" "Fix-It-Plates" total. 1/2" weld bead width maximum, must have at least a 1/2" gap between plates, this also includes the welds. Do not add more than (2) plates per vehicle! Once these plates are welded on, you will not be allowed to remove/move them to run again in the future. Plates may not be used as "kickers".



  • Motor swaps allowed but must use OEM mounting brackets. These may be welded in. No solid motor mounts.

  • Fuel injection and/or carburetor setups may be swapped.

  • Stock motor mounts only. No aftermarket or solid motor mounts are allowed. Motor mounts can be secured by one of 2 of the following ways:


Option 1: (2) wraps of #9 wire around mount.

Option 2: A single loop of 3/8" chain with a single 3/8" bolt allowed but bolt/chain cannot be welded anywhere.

  • Transmission must be mounted in rubber.

  • No protectors, braces, or cradles of any kind allowed, (Example: Distributor protector, transmission brace, engine cradle, etc).

  • Exhaust must exit straight down under vehicle past drivers seat, or straight up through the hood.

  • 3/8" chain or double wrap #9 wire may be used around crossmember and transmission to secure.

  • Crossmember may be stock OR 2" x 2" x 1/4" maximum tubing. A 4"x 4" x 1/4" maximum crossmember mounting plate on each side is allowed, these may be welded with 1/2" weld maximum. No other welding or reinforcing crossmember or mounts allowed.

  • 5 lug maximum rear axle allowed and must be stock appearing. Must bolt into factory mounts in vehicle. No aftermarket trailing arms or brackets. No 8 lug axles allowed.

  • No aftermarket axle shafts, no aftermarket housings or housing braces, no axle-savers, and no pinion brakes will be allowed.

  • Welded differentials are allowed.

  • Stock type driveshafts allowed, no aftermarket/slider shafts.

  • Aftermarket shifters and brake/gas pedals are allowed.

  • Radiator must mount in factory location or be removed.

  • No homemade radiators or reservoir tanks allowed.

  • Radiators can be spray foamed in place.

  • Electrical fans are allowed.


Cages/Driver's Compartment

  • The battery may be relocated to the front passenger floorboard or passenger seat area. It must be securely fastened and covered. Battery/tray must be at least 6" away from any body mount location.

  • Driver door panel can be left in place or suitably replaced. Driver's door must have padding of some


  • Driver's door may be foamed for protection.

  • Drivers door protection is required. We cannot emphasize enough that cannot have too much door protection.

  • Driver's seat must be securely bolted to the floor. Must have a working and approved driver's seat belt

or harness.

  • All cage bars may be 4" x 4" maximum material (or equivalent Example: 2" x 6" tube).

  • A "floating" (4) bar/4-point cage is allowed. Cage may not go further than 10" maximum past front and rear of front door seams. Cage length measured from furthest point forward to furthest point back (not including tank tray) is 60" maximum.

  • Cage must be on the inboard side of the doors, not inside between door metal (where window glass was located). Cage may be welded and/or bolted in.

  • A rollover bar may be used. Rollover bars must be welded to rear of door bars and/or rear side-to-side bar of cage. Rollover bars must go straight up vertically must not be angled and have a single bar across the roof attaching uprights. Bar over roof may be attached to roof in (2) locations in front of the bar with 4" of weld or (2) 3/4" maximum bolt with 4" maximum washers.

  • All parts of cage must be at least 5" above floor and 5" below bottom of door window sills. No down­ legs or kickers of any kind. Cage may only attach body sheet metal. Gusset bars are ok, but must be within interior of 4-point cage and only attach to cage. Dash bar must stay a minimum of 4" away from firewall.

  • Stock fuel tank must be removed. Fuel tank must be replaced with a marine type tank/approved fuel cell. Fuel tank may be securely fastened to rear driver's compartment floor metal or in a tray/holder attached from the cage.

  • A fuel tank tray/protector may be used. Fuel tank tray/protector must have a 4" gap from all sheet metal and may ONLY be attached to the rear side-to-side bar, not the rollover bars. If running a station wagon, the fuel tank tray/protector must be 4" from the back of the middle seat area.

  • Must run wire, chain, seat belt, or a bar in the front windshield area from roof to cowl, welded or bolted to sheet metal only. If using a bar if may not contact cage or engine. Bar may be 2" square tube maximum and may only attach 4" maximum onto roof and cowl.

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