It seems to need less air at idle and at low rpm, closed throttle such as coasting. Along with a lean idle it also bucks and surges bad below 2000 rpm with the throttle closed. Transfer slot are about .040. The tips of the idle tubes are at .052 which is the max they can be drilled. Don't remember the size of the IFRs.
Turning the mixture screws does very little to richen it up. The mixture screw holes are .095. I made metal covers to cover the air bleeds almost completely and the engine really likes it, at least at idle.
Right now the idle A/F is 13.6 and the idle is much better and I don't have to keep tapping the pedal to keep it running. Winging it at idle and throttle response is also much crisper and the engine just plain sounds better now. I just need to drive it with the bleeds covered to find out if I'm causing more problems than I'm fixing.
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