Black Coated Fabricated Aluminum Tall Valve Covers 1/4 inch Billet Rail for SBC 350 383 400 Made from high quality material for long lasting durability FITS SB CHEVY 283 305 327 350 383 400 engines Easy to clean Tall style,Black coated Bolt holes might have lining issues, but will not affect item's application. Extra work might be involved in installation.