David Bertram, Since we have the same engine, I was wondering if you could give me an idea what egt you lean to. Len's spec sheet show 1350F for max power and 1400F for cruise. Seems a little hot! So far 3500 engine RPM, 21.5 manifold and 1300F EGT seems to be about 62% power and around 15 Gph. You concur? Thanks, Michael E Dawson ATCI CFII