Rebuilt Winfield model S carburetor. Throttle size S-1-B and fuel bowl size SBU. Has an adapter to run as a side draft. Adapter can be removed and ran as an updraft. Carburetor was ultrasonic cleaned. All correct brass, high and intermediate compensators , and air bleeds installed. Needles are in nice shape. Throttle is nice and smooth. Carburetor will come with new base gasket and original set of instructions