believe what you want, it seems I'll never convince anybody, but if you were running an EGT you would see the huge difference you make with the .002" jet change.Yes I am, Al these are flathead 4 strokes, there not very efficient and this is with methanol for fuel, if this was a two stroke on gas changing the area of the jet by 8.5% would be a big change, but on these motors on alky, you would know if you ever tuned one that .002 is not a huge deal, I do have jets for every .001 for fine lining, but usually move .002 to make a real change.
so what I hear you saying is; it's such a preposterous idea, it's not even worth trying! What ever!What I believe about tuning these engines is based on years of experience with them on the racetrack and the dyno, can you say the same? If you knew anything about these engines you would realize we run headers around .880 ID or less, an EGT probe placed in that small of an exhaust would be a restriction that would kill exhaust flow. EGT is not an option, get it?