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5500 & 6000 lb Small Block Hot Rod
TIRES; 18.4 x 38 maximum
AGE OF TRACTOR; 1972 and older, no home made tractors
FUEL; Gasoline fuels only with a maximum of 750 specific gravity, no E85, no alcohol, no pressurized fuels, no nitrous oxide, no oxygen accelerate, no nitrogen methanol, and no propylene oxide. Racecar gasoline may be used.
DRAW BAR; Drawbars must not exceed 18 inches in height or less than 18 inches from center of axle to hooking point. No part of draw bar may extend rearward beyond point of hook. No part of drawbar is to be attached to any point higher than the center of rear axle. Drawbars must be stationary in all directions. No clevis, absolutely no turnbuckles.
ENGINE, MANIFOLD, CARBURETOR; Engine must be 410 cubic inches or smaller. Must be a small block, no big blocks. Must be a cast iron block, cast iron heads, maximum eight cylinders. Two valve one spark plug per cylinder. Camshaft in block. Any manifold. One four barrel naturally aspirated carburetor, out of box 750 CFM. No flowed carburetors, no predators, no dominators. No fuel injection, no throttle based injection. Headers or open exhaust are allowed. Headers must exit in an upward direction.
IGNITION; All ignitions must use a MSD system with an 8000 maximum rpm limiter chip.
HOOD, GRILL, FRAME, TRANSMISSION, REAR END, AXLE; Must be for that make and model and must maintain stock appearance and dimension. Sheet metal upgrades are allowed, but must not cross manufacturer’s lines. All upgrades must come to the committee for approval. Front ends may be homemade, maximum allowable wheelbase of 100” from center of rear axle to center of front axle.
TOTAL LENGTH OF TRACTOR; Maximum length 11’ from center of rear axle to the furthest point forward, including weights.
SAFETY EQUIPMENT; Helmet and fire suit, wheelie bars, kill switches, fire extinguishers, fenders, blow proof damper pulley and shroud, SFI flywheels and pressure plates, scatter blanket or SFI bell housings, engine side shields. Drive shaft from bell housing to transmission must be shielded. Roll cages must be capable of supporting tractor and driver. No steel fans. All tractors must have wide front axles with a minimum of 32 inches between inside of tires. All electric fuel pumps must be wired to the kill switch.