[Flathead]

If you have a good core to rebuild, the F-1B is a decent carb. Gaskets are available from Smith and Jones Model A Parts. The float and float valve are the same as Zenith. They are held together with a single bolt like the Zenith, be sure the upper and lower castings fit tight without a gasket before assembling, and be sure all passages are clean. There is an older issue of Skinned Knuckles magazine that has a good article on this carb. with a schematic of the internal passages. There are a lot of these out there so they must have sold quite a few "back in the day".