- 33" maximum DOT tire marked on the tires.

- Must be a mud tire (no straight tread tires).

- No cutting or grooving.

- No paddle tires.

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- Gasline only - No strokers allowed.

- No blowers, alcohol or nitrous allowed. Specialty race fuels are allowed.

- Must be factory OEM rotating assemblies including rods, pistons, crankshafts and their components.

- Factory OEM ignition only.

- No electric fuel pumps

- Maximum engine size, 368 cubic inches - No trans brakes.

- No fuel injection OEM or AFTERMARKET.

- Intake manifold must be OEM cast iron available for that make and year of truck, or an aluminum EDELBROCK PERFORMER low rise only. NO other brand names and no other makes of EDELBROCK.

- Absolutely NO PORTING of heads or intake allowed.

- Carb swaps allowed, vacuum secondary - single pump only.

- Open header allowed, bottom exit only.

- Must run a steady 17 inches of engine manifold vacuum (minimum) at 800 RPM's for 30 seconds. No vacuum pumps or equipment that will produce vacuum.

- OEM installs (not to exceed 1800 rpm's)

- Must have a fan shroud.

- Must have vacuum line routed to front or side of engine bay for easy access by tech personnel.

- Solid cams allowed, no roller cams, no roller rockers.

- No after market heads which includes vortec, n-heads, dart, world, Indy and others.

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- Complete body required, corp. matching, make and model.

- Rear seats and tailgate may be removed - No gutting hoods.

- Must have 2 operating doors - Complete bumpers required.

- Body and interior must be completely intact.

- Hood scoops allowed - Must be rear facing - No isolation trays or plumbing allowed which isolate the air cleaner from the engine compartment or to the bottom of the hood.

- Must have factory front bumper. Tube bumper allowed in the rear.

- Tilt front hood allowed. No gutting of the hood. No removing the components from under the hood or the engine compartment. Hood must be operable.

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- Total body and suspension lift not to exceed four(4) inches.

- Must be factory suspension - Axle swaps allowed

- Must have factory OEM unmodified frame.

- Must be factory transfer case for that year.

- Driver must sit in stock location.

- Tow hooks required, front and rear.

- Must be corp. match transfer case.

- Fuel cells allowed but factory tank must remain mounted in factory location.

- Factory OEM suspension three full length leaf springs minimum allowed. (New of 07).

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- Must meet all safety requirements. - Fire Extinguisher.

- Brake Locks Recommended on manual Trans. Equip. Trucks.