Edelbrock 2691 Thermo Quad Carburetor Adapter
The Edelbrock Thermos Quad Adapter is designed to replace the Original Equipment Unit. The Thermos Quad Adapter offers higher performance than stock. This adapter allows proper installation of carburetor to manifold. The thickness of this adapter is 0. 750. The Thermos Quad Adapter mounts 4-barrel and carter thermos quad carburetors to square-bore, single-plane manifolds.