Anyone know the numbers for a 261 carb .I noticed the other day when I was messing with some linkages to try and hook up my carter carb that I have 3 different Rochester carbs .I do know that one came off a 216 as I took it off myself and the bolt pattern is smaller than the one that came off of my 235 the other carb that was a spare to the origional Rochester that came with my truck looks bigger at the bottom and has 5140 stamped on the bottom of the base and 7005606 long the side of the base .The bowl has7005604 .


1954 Canadian GMC 9300
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