I'm doing a 7042240 from a Buick 455, and I'm at the point where I'm measuring and re-sizing the bleeds, etc...
I"ve found that the upper main air bleed in the body is TINY from the factory - .016! ....Cliff's book says to re-size to .070.... thats alot of drilling! The lower main is already at .070
Before I hog this thing out that much, is there something I'm missing? This is an idle air bypass carb, if that makes a difference.
Thanks, Rhett