Cometic Chevrolet Gen-1 Small Block V8 .094in HTG Exhaust Manifold Gasket Set - 1.625in Round PortsCometic Gasket Inc. Exhaust Gaskets are designed to be used with manifolds or headers. Offered in a range of materials to make sure you are covered with any cylinder head and manifold header combination. All exhaust gaskets are designed to be used without the use of messy sealants. This Part Fits: Year Make Model Submodel 1980 1985,1987 1991 Avanti II Base 1985 Avanti II GT 1980 1981 Buick Century Base 1980 1981 Buick Century Estate 1980 1981 Buick