Machined from 3/4" 6061-T6 aluminum, these billet adaptors are used to convert your stock 1V log manifold to a 2V manifold, allowing you to install any Autolite or Holley 2V carb. The adaptor works on all log style cylinder heads, however the log manifold must be modified prior to installation, which requires the removal of your cylinder head for machining.Includes four stainless steel Allen head cap screws for mounting, (Carb Studs and Phenolic Spacer optional).Image shown painted black, actual product is natural finish.