Doubtful it was overreving, didn't hear the rpm's spike during the run that much, as they run rev limiters so you can't over-rev it too bad one would think. Nor do you we know how old the motor is could have 1 show or 100 shows on it. PC if you look more closer RR planetary was broke during the end of the run which could lead to the trans going at the end. And as far as Cam blowing the motor I didn't know that, the poping you were talking about were Tharindu I thought you were talking about was the backfiring thus why I explained it as such.