Honestly if i have had already purchased the heads i would definatly run them. I know of a couple people on here had problems. I personally have had 3 sets, and know alot of others running around without a problem. I would say that the chances of the seats dropping are very slim. I wouldn't go scraping a set of hemi heads over it. Or you can ship them to me ill use em. i give you my fed ex number, no cost to you.