Edelbrock part #1721 Performer RPM Series fuel pump is for Small-Block and "W Series" Chevrolet designed for use with all Edelbrock carburetors used in Performer or Performer RPM applications. These high-performance's street Fuel Pumps feature a high quality three stage polished finish. The unique valve design improves flow quantity and quality, and will support engines up to 600 hp. High-volume, 3/8" NPT inlet and outlet surpasses the capacity of conventional models. Produces 6 psi and does not require a regulator. Use with gasoline only. Clockable lower housing can be rotated in 60 Deg Increments for best inlet/outlet alignment.