This Mr. Gasket Carburetor Adapter Kit adapter 4-bolt, 4-barrel carburetors to 4-bolt, 2-barrel intake manifolds or 4-bolt, 2-barrel carburetors to 4-bolt, 4-barrel intake manifolds. It is die-cast aluminum, 1 inch thick with an open center. Installs simply between the intake manifold and the carb. Gaskets, bolts, nuts and washers included.