318 pistons revisited

After some further searching (about 2 days worth on the net!) I found reference to a 318 cast piston that is supposed to yield 9:1 compression.

P4529419

Could be an old #?


Cant find it in my Mopar performance catalogue. I'll call the dealer tommorow and see if thier parts guy can tell me anything.

Does anyone know about this piston?