Damage to piston from electrode

[greg3852]

Just thought I’d post up some pics of what happened when I had a spark plug back out of my head. It actually blew the spark plug completely out. Threads were not damaged and I was able to install a new spark plug. Drove at least 5000 miles since. The electrode was missing from the plug. Here is what it did.

 

[Bailey9r]

At some point that must have knocked like crazy. I had a nut drop out of the air cleaner on my Chevelle 454 and it banged while it pulverized the nut till it cleared the head. pulled the head and very little damage which was a relief.