Has anyone tried drilling out the jets on multiple Rochester setups as suggested in the
www.inliners.org tech tips? If so, what was your experience?
11. Start with your smallest number drill and try pushing it through the restriction located under the alum. plug. Go up one drill size at a time until you find the largest that will go into the restriction. See Fig. F. In my carbs that was a .070" drill. Now take the very next drill size larger, place it in a pin vise (cheap), and drill out the restriction. See Fig. G. Go far enough so that you see the end of the drill in the center vent hole. Put everything back together and drive it again. You may or may not see an improvement. If not, or if its not enough, go through it all again with the next size bigger drill bit. Keep going until the hesitation is fixed. I ended up using a .078" which worked quite well on my duals and on another triple set up. Both were 261 engines. Remember this effects only the off idle under gentile acceleration. It also enriches the idle mixture so that a needle adjustment will be necessary.
