I measured the 2 pistons with the least amount of damage exactly where manley states to measure them. I was using 100 octane fuel. There was no oil anywhere in the intake, it all had to come from below. The two pistons in the photo had the most heat related damage. Water temp 230 max and oil temp in the pan 285 max. Could be some detonation but from what I am not sure. The A/F was ok and with that much oil in the combustion chamber WTF knows. The heads, block/sleeves, crank and rods will need to be mearsured but all seem fine. Aside from the aggravation hopefully I'am only out a set of pistons, rings, bearings and machine work. Remenber this engine had about 2 dozen starts, some slow driving arround the hood, a day and a half on the dyno and 10 laps on track. Calls and emails to builder unreturned at this point. Fortunately I have the temperment of a Shaolin Monk and I do enjoy wrenghing on these cars. FMR