Description Designed for high-performance non-emission 1965-76 Olds 400, 425 and 455 c.i.d. engines. 77cc combustion chamber increases the quench area for a more efficient burn, outstanding hp and torque. Complete heads are assembled with stainless steel valves, hardened ductile iron valve seats and phosphor bronze guides. The valvetrain has been upgraded from the factory pedestal-mount system to an ARP 7/16-inch screw-in stud and 3/8-inch pushrod-slot guideplate for increased valvetrain stability. High-velocity, factory location ports feature 188cc intake ports and 106cc raised-floor exhaust ports for more flow. Head bolt holes drilled for stock 7/16-inch bolts, but can be easily modified for 1/2-inch bolts or studs by drilling the 1/2-inch counterbore.
Manufacturer Information Item: Single Performer RPM Olds Head Bare
Item Number: 60529
Approximate Item Package Dimensions: 25" x 11" x 9"
Approximate Item Package Weight: 29 lbs
