Speedmaster PCE140.1002 Fuel Pump Block-Off Plate Small Block Chevy 350 Cast Aluminum With Red Anodized Finish Includes Mounting Bolts and Gasket Each When switching from a mechanical fuel pump to an electric fuel pump, a Speedmaster block-off plate will cover the unused port in your engine block where the mechanical pump used to be. These cast aluminum fuel pump block off plates are available in a variety of finishes and come complete with mounting bolts and gasket.