COMP Cams Alum Timing Cover Chevy Big BThe COMP Cams Three Piece Billet Aluminum Timing Covers for Small and Big Block Chevrolet engines allow access to Camshaft timing adjustments without having to remove the harmonic damper of disturb the oil pan Seal. Designed to be lightweight yet rigid, these billet covers offer convenience and performance in one easy to install package. Catalog User 1 This Part Fits: Year Make Model Submodel 1963,1965 1975 Chevrolet Bel Air Base 1963,1965 1972