Edelbrock part #7159 Performer RPM intake manifold is designed to fit 1958-1965 Chevrolet 348/409 "W" big-block engines with factory large port or with our Performer RPM "W"-series heads #60809 or #60819. Includes Oil Fill Tube (not installed) and matching push-in breather cap. The Oil Fill Tube and Breather are also available separately as #4803. For square-bore carburetors only.