1965-95 Chevy Big Block 396-427-454-502 Tall Polished Aluminum Valve Covers - Smooth Chevy big block smooth polished aluminum valve covers fit 1965-95 Chevy 396-427-454-502 big block engines. Comes with two oil baffles and stainless steel bolt kit. There is one breather hole in each cover. They are the tall style to clear high performance roller rockers. Height: 3-11/16".