Small Chevy Cast Iron Cylinder Head

The Summit Racing SUM-152123 cylinder heads are a cast iron, assembled unit designed for Small Chevy engines. These heads feature a 72cc combustion chamber volume and 165cc intake runner volume, with a 2.020-inch intake valve diameter and a 1.600-inch exhaust valve diameter. The maximum valve lift is 0.490 inches. These cylinder heads are constructed from a superior iron alloy and have ductile iron seats on the exhaust ports to accommodate unleaded gasoline. They are designed to work with small block intakes made before 1987, including the 1969 302. The heads come with screw-in studs and guide plates, and will accommodate center bolt valve covers with minor modifications.