The Chevy Orange Center Bolt Valve Covers are for Chevy Small Block Gen II Engines (305-350 Engines; 1987-pre-LS). Made from stamped steel, they are 20% thicker than typical aftermarket valve covers. They are manufactured to GM specifications, equipped with internal oil drippers and GM-designed baffles. Short (production height) style, and featuring the Ribbed Bowtie Design in black. Supplied with mounting bolts, stainless steel & rubber washers (also available separately as 141-133). Sold in pairs.