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BluePrint Muscle Car Series Small Block Chevy aluminum Cylinder heads, designed for hydraulic flat tappet and hydraulic roller cams. Our 195cc intake runner heads have proven themselves time and time again at making more power than most other value priced heads. Ports and combustion chambers are as cast. Great port and combustion chamber design, combined with high quality 21-4n Stainless steel valves, Viton seals, and double springs make these heads a great value as well as making great power.