ApplicationCompatible for Chevy SBC 283 302 305 327 350 383 400 6351SpecificationFits for 1958-1986 Small Block SBC compatible for Chevy compatible for Chevrolet 283 302 305 327 350 383 400 Engine blocks Brand New and Aluminum cover Surface Finish: Stain Oxidation Height - 3 3/8\" Thick 1/4\" billet rail Each cover has 1 1/4\" baffled breather hole per cover Long bolt style - adds slight inside clearance Perimeter 4 bolt pattern Bolts includedPackage Includes1 Pair Engine Valve Cover Bolts IncludedNoticePlease check the OEM Number before purchase. This is the best way to confirm the fitment. Instruction is not included. Professional installation is recommended Please feel free to contact us for whatever we can help.