Quote: Valve hitting piston removing oil film. Bearing gets damaged resulting in broken rod. Just a guess until motor is disassembled.
It does look from the one and only picture that some exhaust valves hit the pistons. But the broken rod could have caused the #3 valve mark, and the lash cap jamming the #1 open could have caused that. I can't tell.
I wouldn't blame the rod right now, but it needs more investigation to figure out what caused the chain of events.
