Cometic Chevy Gen-I Small Block V8 .040in MLS Cylinder Head Gasket - 4.155in BoresThe HP shim technology increases clampload around the combustion chamber, thereby increasing the sealability of the head gasket around the open deck block. This Part Fits: Year Make Model Submodel 1980 1985 Avanti II Base 1985 Avanti II GT 1980 1981 Buick Century Base 1980 1981 Buick Century Estate 1980 1981 Buick Century Limited 1980 1981 Buick Century Sport 1980 1981 Buick LeSabre Base 1982 Buick LeSabre Custom 1980 1982 Buick LeSabre Limited 1982