My 1 and only Probuilt motor

No it didn’t have any coolant in it. 6500 rpm. It was broken in on the Dyno. The Pro told me the piston was hammering the head. The three bolts came loose on the cam and broke the pin off. He said: I guess thats racing. That sometimes happens. No warranty. Other 7 pistons and rods are good. Only 1 run down the track. Kim