P2R Power Rev Racing Carburetor gaskets will help reduce intake air temps by removing the direct connection of the Carburetor to the intake manifold. By placing this thermal gasket between the Carburetor and the intake manifold, you will help reduce the amount of heat soak the Carburetor normally absorbs. Holley 4 BBL - Open Center (Fits 1-3/4" bore 850, 950, 1000 CFM Carbs) Carter 4 BBL - Open Center - AVS, AFB Demon 4 BBL - Open Center (Race) Edelbrock Performer 4 BBL - Open Center (Square Flange Carbs)