Here is some background about this car.
According to the PO it was sitting in a barn for 10 year. He put in a new gas tank and fuel pump, plus some of the fuel lines, it was all gunked up. He drove the car for a little wile and lost interest and patient to work on it. I rescued the car and took it home drove it a little and it was running not bad.
Since it was leaking like crazy I parked it and decided to take the engine out and seal it.
Here is something what could have over heated cyl # 3, the one with the bad piston. A mouse must have lived in there for a wile, and I don't know many miles the PO did like that.
Would this make sense ?
When I disassembled the engine one head stud of #1 was already snapped, just hanging loose.
The headstuds on #3 were OK.
Thanks for the info on the JE pistons !
Engelbert