Edelbrock RPM Pro Port Pontiac Cylinder Head 72cc Bare Fits select: 1972-1979 PONTIAC FIREBIRD, 1970-1971 PONTIAC GTO

Pontiac Performer RPM Cylinder Head 1962-1979 389-455ci Port Volume: 215cc/175cc Valve Size: 2.11"/1.66" 7/16" Rocker Studs Valve Angle: 14 Degrees Semi-Finished, Sold Each A 72cc chamber version for high-compression, racing applications. Heads have Ram Air IV exhaust port flanges. Requires head bolt kit #350-8556 for cylinder heads manufactured before 3/15/02. For cylinder heads manufactured after 3/15/02 bolt kit #350-8549 will be required. Tech Tip To gain more spark plug clearance, Edelbrock recommends using Champion RC Series plugs, such as the RC12YC (P/N 192-49776). They are 0.230'' shorter than conventional spark plugs and have a 5/8'' hex for easier access. Note:Semi-machined version must be finished by a professional head porter (it comes with valve guides and seats installed with no intake pushrod holes). (B) Recommended valve sizes.

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