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Just a guess butI would say that whovever worked on thecarbs in the pastput those numbers on the tops for his own reference prior to disassembly . They are not numbered per cylinder. When working on carbs all parts have to returned to their original locationand the easiest way to do that is to number them. I always use an electric engraver to mark carbs and bodiesI work on because carb cleaning fluid or gaswill wash off any type of liquid pen markings etc and then you run the risk of mixing up parts. If you are not having any issues with your carbs I would leave them alone. I also think that if you ever have occassion to disassemble them you should leave the numbers in the same spots,,,,,GM
Just a guess butI would say that whovever worked on thecarbs in the pastput those numbers on the tops for his own reference prior to disassembly . They are not numbered per cylinder. When working on carbs all parts have to returned to their original locationand the easiest way to do that is to number them. I always use an electric engraver to mark carbs and bodiesI work on because carb cleaning fluid or gaswill wash off any type of liquid pen markings etc and then you run the risk of mixing up parts. If you are not having any issues with your carbs I would leave them alone. I also think that if you ever have occassion to disassemble them you should leave the numbers in the same spots,,,,,GM