We took off the heads and on #2 the top of the piston looked like the surface of the moon. The top most ring has become seized by the heat Around the valves the metal looked like it had melted and rehardened. Half of a valve guide was missing like it was broken off. Two of the swivel adjusters were broken. Amazingly, the cylinders look good. No scoring visible. tomorrow we will split the case and see what other horrors the God of mechanics can come up with.