The Edelbrock Performer RPM Cylinder Head for 1965-76 Oldsmobile 400, 425 and 455 CID V8 engines is the perfect performance upgrade for big-block Olds-powered street machines and muscle cars. Available in Hydraulic Roller and Hydraulic Flat Tappet applications this aluminum cylinder head supersedes the previous 60515/60519 Olds heads and features a redesigned 77cc heart shaped combustion chamber, larger intake valves and refined bowl blending for improved flow. Intake and exhaust ports have been improved over previous designs, and extra material has been added above the intake port for head work. The Performer RPM head has improved clearance for a factory-style mechanical fuel pump and spark plug locations moved slightly towards the exhaust valve for optimized combustion. 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. These heads are cast and machined by Edelbrock in the USA and comes complete with the highest quality intake and exhaust valves and valve springs.

Tech Specs Cylinder Head Series: Performer RPM Material: Aluminum Horsepower: 450-600 HP Intake Runner Volume: 218 cc Exhaust Runner Volume: 128cc CNC Ported: No Deck Thickness: 0.625 in Valve Angle: 6 deg Intake Valve Dia: 2.150 in Exhaust Valve Dia: 1.680 in Valve Stem Diameter: 0.3438 in Valve Seat Material: Hardened Ductile Iron Valve Guide Material: Bronze Seat Angle: Exhaust 60 deg/Intake 60 deg Combustion Chamber Volume: 77 cc Guide Plates Included: Yes Guide Plate Material: Hardened Steel Push Rod Diameter (Suggested) 0.375 in Rocker Stud Diameter 0.4375 in Valve Spring Diameter: 1.460 Roller springs: #5845 Open Pressure: 420 Flat tap Springs: #5767 Open Pressure: 310 Valve Spring Maximum Lift: 0.600 in Recommended Spark Plugs: Champion RC12YC Warranty: 12 Months