Ultimate Performance Carburetor Kits These are absolutely the finest Carburetor Kits available anywhere at any price! AED combined every possible add-on feature and incorporated them into each kit to give you long and improved performance from your Holley Carburetor. Includes all Reusable Bowl and Metering Block Gaskets! Listed are just some of the standard features that set AED kits apart from the competition: Standard are high-flow . 110" needle and seats. Nylon reusable needle and seat gaskets. Nylon reusable bowl screw gaskets. New brass idle mixture screws. New needle and seat nuts and screwsNew accelerator pump squirter check valves. Special no-leak fuel inlet gaskets. Trick gasketed vacuum secondary diaphragms. Only the highest quality components made.Pit Stop USA offers AED Ultimate Performance Carburetor Kit - For 390-950 CFM Holley 4150 Series Carburetors 4150 at low everyday prices. Be sure to check out all of our products from AED - Advanced Engine Design including AED Rebuild Kits.