A buddy has a billet Ford Racing flywheel that he says that I can have, but he can't remember if it's 28 0z or 50 oz imbalance. There aren't any numbers stamped on it. It has 5 large holes on one end of the back side, which I assume are for balancing since there are no counter weights on it. Unfortunately, I didn't have a camera with me. Can anyone give me some help with identification?