COMP Cams Magnum Double Row Timing Set OldsFeature 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 1975 Buick Apollo Base 1975 Buick Apollo SR 1972 1973 Buick Centurion Base 1973 1974,1977 Buick Century Base 1977 Buick Century Custom 1973 1974 Buick Century Luxus 1972