Engine Clanking -WTF!!!

[sleepydsm]

Before I saw the findings, I asked my uncle (the most mechanically capable person I know) how or why this would have happened, and he thought something foreign entered the cylinder, piston pushed it against a valve/hit spark plug, then the cam trying to open the stuck valve breaks rocker arm, etc. I wonder if something got in there?

I personally have honed/installed a new piston and ring set into a cylinder with three giant gouges in the thrust side of the wall, probably.050" deep, and the car had 155 compression in that cylinder and didnt use excessive oil.