50-state street legal aluminum heads for 1987-95 Chevy 5.7L engines (except LT1, LT4 and LT5 Corvettes) originally equipped with centerbolt valve covers and the 1987 and later intake manifold bolt pattern. The high-velocity intake runner is designed to work with either T.B.I. or Tuned Port Injection systems. The 60cc combustion chamber maintains the stock compression ratio when used with the recommended head gasket. They accept stock centerbolt or Edelbrock aluminum valve covers #4246 and #4247. Available with straight plugs only. Hardened pushrods required.