This popular international class attracts the largest competitor entries of the three classes. Racing is fiercely competitive and every year the standard of equipment and level of professionalism steps up, usually only fractions of a second separate each driver, action packed jetsprint racing at its best!
Engines are restricted to 412 cubic inch engines with iron block and cylinder heads and a maximum of 8 cylinders. Cylinder heads restricted to OEM 23 degree with two valves per cylinder, pushrod operated. Wet sump lubrication system. Induction via single 4-barrel carburetor. 100 octane Avgas fuel. Engines not exceeding 365 cubic inches maximum capacity may be fitted with aluminium cylinder heads conforming to the rules.Generally Chevrolet and Ford V8 engines share common rules, but specific components are listed by part number. The top motors produce up to 630 horsepower.