OEM cylinder head required with a maximum of two valves per cylinder. NO overhead cams. Stock fuel for make and model of tractor. No nitrous or alcohol. One fuel pump or single fuel delivery system.
Water injection is optional.
Tractor must have wide front axles. Rear brakes are mandatory. Engines must be secured and held rigid in chassis. A deflection shield is required on both sides of all engines. Engine shields must extended rhw xomplete length of the block.