I have NEVER done this, but reading some old vintage repair manuals, I have, they say you can use stock pistons on an engine with ten thousands over bore, any larger and you need new pistons. Is this true ? And would you have to have ten over rings to make this work, or some custom rings? Once again, I have never attempted this, and I am not claiming it will or wont work, I only read about it, and was wondering if its true on current engines, or just what people used to do in the 30's 40's or a racers trick??