Hey guys, I ended up getting these as a partial trade. Apparently these are from a 400ci SBC. Is that the case? He also stated these are the stock pistons. Also, what is the best way to clean them? as you can tell they are atrociously filthy. Last question, as I dont really have any use for them at the moment; whats a good asking price for them? thanks a ton for reading this and offering any help you can! ^ Yes I whacked my thumb at work, but its on the mend.