The Edelbrock Quadra jet Adapter allows using almost any carburetor on almost any intake, saving the hassle and expense of purchasing all new components when changing carburetors or intakes. It is designed to replace the original equipment unit. The Quadra jet adapter offers a higher performance than stock. This adapter allows proper installation of carburetor to manifold. The thickness of this adapter is 0. 750. This adapter mounts 4 barrel and carter thermos quad carburetors to square-bore, single-plane manifolds.