OK, lets see if I get this straight. It is a factory 302 piston,right?
The TRW forging nuimber is like many GM part #s of that era,even the same number of digits, thats is why I assumed it was a GM part number.
I have some 70s vintage overbore pistons and they actually have 2210A stamped on them,these dont.The forging # appears to be 186-99.
I knew John Z would have the answer,correct me if I misunderstand. THANKS!!!