Gasket Set, Edelbrock, Performer RPM, Oldsmobile 400-455

Designed for high-performance emission-controlled 1965-72 Olds 400, 425 and 455 CID engines. Features include improved 77cc combustion chamber design that increases the quench area for a more efficient burn increased horsepower and torque. Complete heads are assembled with stainless steel 2.072" intake valves and 1.680" exhaust valves, hardened ductile iron valve seats and phosphor bronze guides. The valvetrain is upgraded from the factory pedestal-mount system to a 7/16" screw-in stud and 3/8" pushrod-slot guideplate for increased valvetrain stability. High-velocity ports feature 188cc intake runners and 106cc raised-floor exhaust runners for increased flow and power. Aftermarket rocker arms and hardened pushrods are required for installation. Heads will fit 350-403 Olds with Edelbrock manifold part# C207111 only.