Due to the number of different Manifold designs currently in the high performance marketplace, the Holley 17–82 sealing plate kit was designed to ensure a perfect installation of your new carburetor. Some square–bore and spread–bore Manifolds with thin sealing flanges do not provide adequate gasket sealing surfaces. This sealing plate kit provides the additional support needed for a "No–Trouble" installation. Includes sealing plate and two flange gaskets.