Its hard to believe what can happen to some of these engines. My Friend bought a chevy small block (short block) from a well know Ohio Company and He made 2 passes on a test n tune and on the 3rd one I ran over to the fence at half track to watch. He heated his tires and before he could stage his headlights went out and they pushed him off the track. We thought at first his battery died and it shut off but I did some checking and it was locked up. The piston EXPLODED. They wanted the engine back for an investigation and the piton parts were sent to the manufacture. I read the 6-8 page report and it came down to dirty engine assembly work. They sent him a new short block and its going on its third season.