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The Edelbrock Performer RPM semi-finished cylinder head for 1962-1979 Pontiac 389-455 engines is patterned after the 1969-70 Ram Air IV head and is intended for higher-compression builds with a 72cc combustion chamber. This semi-machined, porter-version head includes valve guides and seats but requires professional finishing and porting before use.
Edelbrock Single Perf Pontiac Semi Finshed Head
