BPT has the best $$ value carburetor kits available! These kits feature OEM Holley components and are a full rebuild kit, not a "quick kit" or budget kit like some others. features include 30cc accelerator pump diaphragm, high- flow .110" needle & seats, 2- high flow power valves, blue non-stick bowl and metering block gaskets, nylon reusable bowl screw gaskets, special no leak fuel inlet gaskets. vacuum diaphragm, air filer gasket, carburetor mounting gasket, and misc. hardware. fits Holley model 4150 gasoline vacuum secondary performance carburetors such as list #3310, 3310-1, and other similar vacuum secondary performance carburetors with a secondary metering block. please see our store listings for a complete selection of rebuild kits for gas, alcohol, and E-85 applications and hard to find parts for Holley carburetors.