Carb difference question

I two sets of carbs, the original 26mm's and what I am 99%sure are 28mm's bored out. The two carbs look alot alike but I noticed on the 26's there is only one vacuum line which is blocked off on the #1 carb (one with choke) on the 28's there is one there and on the 3rd carb. Any advice on that? also my 26's have two gas lines one going in between each pair of carbs and the 28's have only 1 gas inlet in the middle of all of the carbs?? Sound ok? do I need a single outlet petcock? Thanks for any comments

Ok the question is what do I need to do to make the 28's center fuel inlet work when I have a double petcock?

chelms27 wrote:

Ok the question is what do I need to do to make the 28's center fuel inlet work when I have a double petcock?

Okay to use either petcock outlet and cap off the other unused petcock outlet (a vacuum plug sometimes works just fine).

Good Luck!

ok, I will try that. Thanks