[zimmy]

Don't get too hung up on the old "rule of thumb" thoughts for # of turns out etc. Today's fuels are very different and can have very big effects on the behavior of the IDAs. Today's fuel has a lot of oxygenators in the fuel meaning that you have to run a bit richer to compensate. My 454 with 48 IDAs runs and idle best with the idle mixture screws at about 1 1/4 turns out - not the "gospel" 3/4 of a turn. It really is necessary today to use these old rules as baselines, but go with what your engine wants to run with. Don't lock yourself into only what historically was the answer. Times have changed!!