This is a bare, unfinished cast iron exhaust manifold for a 1973-76 Chevrolet 454 engine. It is designed to be mounted on the right side of the vehicle using a bolt-on style. This vintage part does not have an oxygen sensor port and is not a performance part. It is a universal fitment and can be used on other vehicles. The manufacturer part number is 353030 and the OE/OEM part number is the same.