Short Description
Designed for 1965-1979 389-455 c.i.d. Pontiac engines, these heads are patterned after the 1969-1970 Ram Air IV Pontiac cylinder head. Two styles are available: 87cc combustion chamber version for applications requiring an 87cc combustion chamber and a 72cc chamber version for applications requiring a 72cc combustion chamber. Both heads have Ram Air IV port flanges. Performer RPM Pontiac heads produce outstanding horsepower with excellent low speed torque and throttle response. High flow exhaust ports require Ram Air IV headers or exhaust manifolds. On both versions, the deck surface is 5/8″ thick for superior durability and head gasket retention. All factory accessory bosses are included for bolt-on convenience. Performer heads #60569 and #60579 have the exhaust heat cross-over machined and are street legal on 1965-1979 vehicles with 389-455 c.i.d. V8s without secondary air injection. Note: In 1967-1968 Pontiac, change valve angle from 17° to 14°. Edelbrock Pontiac cylinder heads use the later 14° valve angle. When installing Edelbrock Pontiac cylinder heads on 1965-1966 and some 1967 engines that came stock with the early 17° valve angle, compatibility of valves with pistons will need to be checked.
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Content
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PONTIAC CYLINDER HEAD INTAKE MANIFOLD
GASKET FITTING:
NOTE 1: The position of the intake port entry on all Edelbrock Pontiac cylinder heads has the same roof height as a Pontiac 455 Super Duty cylinder head. This was done to provide the best performing intake port while maintaining a stock Pontiac port location. The Fel-Pro 1233 intake manifold gasket has a port roof to intake manifold bolt hole centerline dimension that is .06″ lower than 455 Super Duty head dimension. When installing the Fel-Pro 1233 intake gasket on Edelbrock Pontiac cylinder heads, align the gasket with the intake port entries. Three of the bolt holes in the gasket will have to be elongated as shown in the illustration. NOTE 2: The radii of the intake port entry corners on Edelbrock Pontiac cylinder heads is 3/16″ to maximize the cross-sectional area through smallest part of the port. The corners of the intake port openings of a Fel-Pro 1233 intake manifold gasket are 3/8″. If you are using the intake manifold without port-matching the runner exits or if you port match to the 3/8″ radius, you do not have to modify the corners of the port openings in the gasket. If you are port-matching to the 3/16″ radii in the cylinder head, then the corners of the gasket port opening should be modified.
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