I recently bought a set of used Champion irons from a board member and I took them to my engine builder to have them checked out before I installed them. I got a call from the builder this morning and it turns out that both heads have a crack in the valve spring area. The builder says he believes that they could be repaired but of course there is no gaurantee that will work and not be an issue in the future. I went with iron heads because I have read about Champion aluminum heads cracking and I wanted to avoid that if possible. I would be interested in hearing some opinions on having these heads repaired. The builder put some machinist dye on the heads so that the cracks would show in the pics. I contacted the seller but he has not had time to respond yet.