Oldsmobile Edelbrock Performer RPM Aluminum Cylinder Heads: Summit Racing

Letting Power go to Your Heads

Oldsmobile 400 and 455 cubic inch engines can make excellent power if they get enough airflow. That’s why Edelbrock has updated its Performer RPM Aluminum Cylinder Heads just for these engines. It features big 217cc intake and 128cc exhaust runners, and there is plenty of metal in the port walls and above the intake port to enlarge them for even more flow. The heart-shaped 77cc combustion chambers have optimized spark plug positions for a more efficient burn of the air/fuel charge, and improved water jackets for excellent cooling and to better accommodate a relief for factory-style mechanical fuel pumps.

The Edelbrock Performer RPM Aluminum Cylinder Heads come fully assembled with valves, valve springs, locks, and retainers. They’re designed for 1965-1976 Olds 400-455 CID engines with a 4.125 inch minimum bore and a hydraulic roller camshaft.

Specifications

• 217cc intake and 128cc exhaust runners
• 77cc combustion chambers with stainless steel 2.150″ intake and 1.680″ exhaust valves
• 1.460″ dual valve springs rated to .600″ of valve lift
• 7/16″ screw-in studs for stud-mount rocker arms and 3/8″ guideplates for increased valvetrain stability
• Factory counterbored head bolt holes for 1/2″ diameter head studs
• Separate center exhaust port exit with no heat crossover
• 5/8″ thick decks
• Bronze valve guides and ductile iron valve seats
• Helicoil inserts in the exhaust and rocker stud threaded holes