I have to say the crank broke - I have a pic and if you look you can see a crack through the journal buy the refection(not good pic). This was a cast crank and we were putting out a little north of 450 hp, plus the fact that it had been trans braked also - it wasn't made for that. The only indication something was up, we were at Summit Race Way Park for the No Box Bonanza for the 3 day event and on the last day the car fell off .04, top end was there but lost it in the bottom . We won the race and I though he had let off which he didn't. .04 sec isn't much the this car is dead on. Checked everything out and couldn't find anything. Went up next round holding a few, won the race but there was no letting off and we lost another .01 when the computer said we should have picked up a hundredth. We packed up and left on a live entry thinking something was going south. Checked the car out, dropped the trans pan, cut the oil filter open, everything looked great, fuel pr was a little of and found a bunch of crap in the carb. That seemed to make sense that a primary circuit had got some crap in it hurting the bottom end. The 3 day Fourth of July event at Mid Michigan proved different. My son will shut the car down in a heart beat if he feels something isn't right - no warning, no noise.