Quote: You may or may not have over-reved the engine.
But, look at the exhaust valve marks in the piston. Bet the bearing was getting a hard lick too due to the hammering taking place at the piston with the valve beating into the pistons.
Think about this the exhaust valve and piston are running towards each other. Really hard lick. The bearing takes a lot of abuse from this. Finally the rod breaks and you got a bigger mess.
At least you are running an alluminum block. It can be fixed pretty quickly.
Finding out why you have collisions going on in your engine may take a while longer.
Leon
I thought I seen a little valve mark on the piston but wasn't sure.
it's hell getting old
