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The Edelbrock Performer RPM CNC bare cylinder head for 1962–1979 Pontiac 389–455 engines is equipped with an 87cc CNC-machined combustion chamber suited to 9.5:1 compression street engines running lower-octane fuel. Patterned after the Ram Air IV port flange, the CNC chamber ensures consistent chamber shape and flow for reliable street performance while serving as a precise base for rebuilds and performance assemblies.
Edelbrock Cylinder Head Pontiac Performer RPM CNC Chamber 87cc Bare Single
