after getting this engine , i changed the bearings .then i ran the engine to see if the carb and pump were ok.the only prop i used was a 13x8 apc. it turned 11300. i should have tried props to load the engine down in the 9700 to 10200 RPM range.i will have to do this in the future as i am pretty confident my wife will win the bid, even if it costs me the f,in fees.