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The Edelbrock RPM Performer cylinder heads feature 2.02/1.60-inch valves with 64cc combustion chambers and angled plugs. The spark plugs are angled at the center of the cylinder in order to improve combustion efficiency. The production 170cc intake port on this cylinder head worked well with our 332.
Edelbrock Performer RPM Package - Small Displacement Big Punch

The Edelbrock RPM Performer cylinder heads feature 2.02/1.60-inch valves with 64cc combustion chambers and angled plugs. The spark plugs are angled at the center of the cylinder in order to improve combustion efficiency. The production 170cc intake port on this cylinder head worked well with our 332.  View Related Article