I just found these in the garage attic of a 70s drag racer. They look to be original equipment 69 L88 427 Chevy high dome pistons. They are early STANDARD BORE. They are all embossed with TRW on the underside and stamped with GM # 3947886 on the tops. Sorry, I only have 5 pistons. They look like survivor pistons from an engine failure. There are a few nicks on the tops. That said, these pistons are still in usable condition. The ring slots and wrist pins all look good. No broken skirts. They should be ready to use. A rare find.