Product Description Primary 3-Bolt 2-Barrel Flathead Carburetor Complete 184CFM Material:Aluminum Drive Type: Mechanical Choke Finish:Natural Choke Type:Manual Fuel Type:Gasoline Carburetor Flange Type:2-Barrel 3-Bolt 3" of Vacuum - 60 CFM 10" of Vacuum - 110 CFM 15" of Vacuum - 136 1/2 CFM 28" of Vacuum - 184 CFM Stainless steel screws and hardware Grose-style jet valve wont corrode in modern fuel Comes with a No. 65 power valve and 0.045" main jets Choke assembly, accelerator pump, and jets have all been faithfully retained and accept standard Stromberg parts Features 0.97" venturi diameter Modern Nitrophyl float and Neoprene gaskets Extended brass throttle shaft to simplify multi-carb linkage Professional Installation is Highly Recommended (No Instruction Include).