SherryBerg classic carburetor ,New Universal High Quality carburetor made especially for Chevrolet 6 cyl engines to replace original Rochester model B/BC 1bbl factory carburetors. Fits most Chevy engines 216 up thru 261 cubic inch 6 cyl 1937-1967. Some applications may require a different air filter than factory stock. Pre-jetted, manual choke, and bolts right on with no modifications , New OEM product , Not the rebuild or reman. Notes: the carburetor is the specail complex parts , suggest the tech man to install and adjust .