TORRANCE, CA – Edelbrock has heard the requests from the Oldsmobile faithful and is responding by releasing a new and improved Performer RPM Cylinder Head for the Big Block Oldsmobile V8. This new head features a modern 77cc combustion chamber, new larger 2.150″ intake valve and updated ports for improved flow characteristics. The head has an updated water jacket for excellent cooling and to better accommodate a relief for factory style mechanical fuel pumps. It is intended for installation on 1965-1976 Big Block Oldsmobile Engines with non-emission 400-455 c.i.d., with a 4.125″ min bore.

Edelbrock has retained the thick 5/8" deck, bronze guides, ductile iron seats, one-piece stainless-steel valves, and high-quality rocker studs. The updated ports are excellent out of the box, but porters will rejoice at the thick port walls and added material above the intake port. Designed in-house, these are cast from A356 aluminum, heat-treated to T-6 specs, and machined in Edelbrock’s Southern California manufacturing facilities for unsurpassed quality.

• 77cc heart shaped chamber with optimized spark plug position for a more efficient burn, outstanding horsepower & tire-shredding torque

• Improved intake & exhaust port flow w/ OEM position intake port entry/exhaust port exit

• Factory pedestal-mount valve train upgraded to 7/16" screw-in stud and 3/8" pushrod-slot guide plate for increased valve train stability

• Helicoil inserts in the exhaust & rocker stud threaded holes

• Pre-counterbored head bolt holes for ½” diameter studs

• Center exhaust port exit is separate with no heat cross over

• Added material above intake port

• Mechanical fuel pump clearance cut

Part# 61029