Plastic carburetor spacers reduce the fuel temperature inside the carburetor by insulating the carb from the hot intake manifold. This results in a denser air/fuel mixutre for more power. Four-hole design increases low-end torque compared to open style spacers. Fits 4150 and 4160 series Holley carbs 4 barrel carburetors 1.688" venturi bores Gaskets included 1/2" Tall Studs & Nuts Included
