Maximum Top Sportsman, Top Dragster, Pro Mod and Pro Street competition. Excellent with alcohol and nitrous, over 7,000 RPM, over 500 cubic inches. The original Dart Big Chief put the spread port design on the map, winning three NHRA Pro Stock championships before being banned from the class. Dart has applied the PRO1 design concept to the Big Chief in order to help make spread port technology more affordable for Sportsman racers. High flowing as cast ports combined with CNC machined chambers and bowls deliver awesome power. Big Chief PRO1 18° and 14° head assemblies include hardened seats and stainless valves. Copper seats and Titanium valves are optional.

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