Edelbrock part #7329 head gasket is intended for AMC 304-401 CID V8 engines. This gasket comes as a set and has a 4.275" bore size, .045" compressed thickness and 10.6 cc volume. This gasket will fit the 304 AMC small bore applications even though the Edelbrock cylinder head will not. This head gasket is graphite with a steel core and has a stainless steel fire ring. Gasket is compatible with cast iron or aluminum cylinder heads.