Ok heres the deal, 2 bbl 500 cfm 360ci chevy V-8, comp roller lifters, forged crank, pistons and rods, comp 4-7 swap cam with stud girdles, brodex spec aluminum heads with Ferrea valves. We race in a winged sprint car class. After break in we switched to Amsoil 20W-50 Series 2000. After appx 13 racers she went pop.....( there was 1 race on the oil in the car this race was to be the 2nd) numerous holes were in the oil pan, and a wrist pin actually left the pan. After tear down the 7-8 rod journal was cooked(#8 rod is the one that failed). Some other rod bearings showed some pitting, but it wasnt real bad, IMO any pitting after 13 races is a worry, oh and some of the mains showed some signs of pitting as well. The only thing that really struck me as odd during the tear down was that the rod bolts were smoked, it took all the driver had to break the bolts loose with a 1/2 drive inch breaker bar. I sent the oil in for sample but have yet to receive the results. I have talked to several major players in the sprint car world, from Boyds in Norman, Ok to Gaerte in Indiana. They are of the same opinion that they doubt that the oil failed or that the thin nature of the full synthetic had any thing to do with it. So my question to you guys is, what might have caused the engine to pop........