Just heard rumour today, that the engine was fine - right fuelflows, right temperatures, manifold pressure and revs. Valves were not burnt, everything fine exept for possible shockloading from the crash.
Aircraft used to have a IO-520 but got a IO-550 built in recently. Latter engine definatly needs a richer mixture on TKOF - Speculation: maybe the pilot set FF for a 520 and therefor did not get the performance because it was too lean ?
Could be water in the fuel as well, had quite a bit in my fuel tester during that time, although fuel test at Eros after the incedent was proven ok.
So it is still an enigma...