Engine Cylinder HeadThe Edelbrock #5089 E Street cylinder heads are designed for use with 1955 1986 Small Block Chevy applications. The Edelbrock E Street cylinder heads offer American made quality and affordable performance. E Street cylinder heads feature as cast ports and are designed for entry level street performance applications operating in the idle to 5500 rpm range. The modern combustion chamber designs improve the combustion process and larger than stock intake