Since the problem seems to exist throughout the AFB, AVS and Edelbrock series, the tube orifice size varies with the booster. We always increased the orifice two drill sizes at a time without paying any attention to the actual drill size.
That works for you. You must have a full set of tiny drill bits to choose from. But not everybody does.
A post or two later, it is noted that the drill range is " .035" on the 600cfm carbs and somewhere between .037"-.040" on the 750's and 800's." That is more very good info for those that don't want to buy a full set of drill bits to find that one or two that they will need to fix their CarterBrock's problem.
