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 latest Big Chief evolution with an 11° valve angle, this head features a multitude of revisions: relocated valve centers, relocated port cores, and a redesigned valve train for increased power and reliability. With our sophisticated CNC machining programs, we can tailor a pair of Big Chief II heads to fit your exact engine combination. Copper seats are standard and assemblies come with Titanium valves. Standard 2.500?/1.850? intake/exhaust valves.

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