1958-86 Chevy Small Block 283-400 Tall Smooth Steel Valve Covers - Black Chevy small block tall black steel valve covers fit 1958-86 Chevy 283-305-327-350 small block engines. They are baffled and tall style to clear high performance roller rockers. One cover has a single 1.25" breather hole, the other side has two holes (one 1.25" breather hole, and one hole for a twist-in cap. Height: 3-5/8".