Cylinder Head, Performer RPM, 1962-77 Pontiac 389-455, CNC Chamber 87cc, Bare

Precision Machined Ready for assembly

The Edelbrock Performer RPM CNC Bare Cylinder Head has the same specifications as the popular Performer RPM cylinder head for 1962-77 389-455 c.i.d. Pontiac engines, but feature a CNC machined combustion chamber. The CNC machined chamber results in a consistent and precise chamber for improved flow performance. Performer RPM CNC cylinder heads are available in two chamber sizes, 72 or 87cc. The 72cc chamber heads are best suited for higher compression engines while the 87cc chamber version is ideal for 9.5:1 engines and will deliver excellent street performance on low octane fuel. These cylinder heads are patterned after the same port flange configuration as the 1969-1970 Ram-Air IV Pontiac Cylinder Head. Guideplates and rocker studs are included.

Tech Specs Deck Thickness: 0.625 in Deck Height: 10.250 in Intake Runner Volume: 215cc Exhaust Runner Volume: 175cc Combustion Chamber Volume: 72 or 87cc Valve Angle: 14 degrees Suggested Intake Valve Diameter: 2.11 in Suggested Exhaust Valve Diameter: 1.66 in Seat Angle: Exhaust 45 deg/Intake 45 deg Guide Plate Material: Hardened Steel Pushrod Diameter: 5/16" (width of slot in guide plate) Rocker Stud diameter: 7/16"