I noticed that the Zenith 228s made for a GMC 270 had a couple of variants. I apologize if its been discussed before but I couldn't find anything with the search function.

There are:
228AV11
228AV12
228BV11
228BV12
228BV11C
228BV12C

I read on an old post from Carbking that the "A" and "B" refer to the throttle/choke orientation but it was elaborated how. The "11" and "12" weren't discussed. The "c" was also not discussed.

I am needing a carb for a 261. I know I need a 175 base (2 15/16" intake stud spacing). I am sure all these could work with some fiddling but which model is less painful?

Last edited by Danielbolt; 09/21/2023 9:55 PM.

~ Daniel Davidson
1939/1940 Chevrolet/GMC
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