1958-86 Chevy Small Block 283-305-327-350-400 Short Polished Aluminum Valve Covers - Smooth Chevy small block smooth polished aluminum valve covers fit 1958-86 Chevy 283-305-327-350-400 small block engines. They are baffled and short (OEM) style. There is one hole in each cover. Height 2-9/16".