I have two what were purported to be B carbs. W/O gav that are pretty much identical to my other two which have a gav. They have tags that say B2, and #s 124 on the upper section. What do I have???
For a while I collected Model A carbs. Rule of thumb - the inclined GAV POSITIVELY identifies a carb as headed for the Model A. Other carbs may work on the Model A - but unless they had the inclined GAV I bypassed them.
Your standard (and use) may differ. Maybe even mine.
The Kingston Carb (fer instance) was used on the Gleaner - which "kind" of qualifies it as a Model A Carb - but no inclined GAV.
I have one that looks like a Mod. A zenith, but the base where it bolts to the manifold is rotated 90 deg. and it's fitted with a choke cable. I can't find anything it fit. Some have said it was used on a Fordson tractor.
Terry