Cylinder Head, Performer RPM, 1962-77 Pontiac 389-455, 72cc, Bare, Semi-finished

Blank Canvas For Maximum Power

The Edelbrock Performer RPM Pro Port bare cylinder head is designed for outstanding performance gains in 1962-79 389-455 c.i.d. Pontiac engines. They are patterned after the 1969-70 Ram Air IV Pontiac cylinder head and have 215cc intake ports 175cc exhaust ports and 72cc combustion chambers. These heads are semi-machined with valve guides and seats installed, but must be finished by a professional cylinder head porter. The ports are as cast which leaves room for them to work their magic. The intake pushrod hole location is left up to them as well so the desired location can be placed. 12 Month Warranty.

Tech Specs Deck Thickness: 0.625 in Deck Height: 10.250 in Intake Runner Volume: 215cc Exhaust Runner Volume: 175cc Combustion Chamber Volume: possible 72cc Valve Angle: 14 degrees Suggested Intake Valve Diameter: 2.11 in Suggested Exhaust Valve Diameter: 1.46 in. x 1.40 in Seat Angle: Exhaust 45 deg/Intake 45 deg Pushrod Diameter: 5/16" Drilled and tapped for 7/16-14 Rocker stud