COMP Cams Magnum Double Row Timing Set PonFeature induction hardened cast iron Camshaft Gear and billet Steel crank sprocket. 3 keyway crank sprocket for 4 degree incremental adjustability, 4 degree maximum advance retard. Heavy duty, heat treated double row timing chain Catalog User 1 This Part Fits: Year Make Model Submodel 1972 Buick Centurion Base 1980 1981 Buick Century Base 1979 Buick Century Custom 1980 1981 Buick Century Estate 1979 1981 Buick Century Limited 1979 Buick Century