Fits any 4-bolt, 4bbl to any small 4-bolt, 2bbl manifold and/ or 4-bolt, 2bbl to any 4-bolt, 4bbl manifold (except spread- bore applications). Measures 1" nominal height of adapter only without gasket. These carburetor adapter kits install quickly and easily. Gaskets, studs, nuts and washers are included. Adapters are made of diecast aluminum.Pit Stop USA offers Mr. Gasket Aluminum Carburetor Adapter - Converts Holley 2 BBL to Holley 4 BBL Intake Manifold 1933 at low everyday prices. Be sure to check out all of our products from Mr. Gasket including Mr. Gasket Carburetor Adapters.