100cc semi-open chamber heads feature a 1-1/2° rolled over (angle milled) design that improves intake port alignment and provides a smaller combustion chamber without shrouding the valves.
9.2:1 compression with flat-top pistons for an outstanding high performance street head.
8.8:1 compression ratio when used on 1987-95 TBI-equipped 7.4L dished piston engines.
Performer applications include heat crossover passage for emissions related engines.
Performer 454-O are 50-state street legal.
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