My machinist checked my Stealths.He thought the stock keepers looked thin.He miked them compared to what he uses and they were the same.He is a perfectionist and to look OK to him is tough.I upgraded because of my combo.If I had bought Eddys I still would have changed what I did.I still would of had him check them also.No matter if they are a 1000 a set or 3000 a set I would have them checked.They are assembled quick on a production line.The 200 I spent to have him check them and do the light work was cheap.He just cleaned up the ports a bit and back cut them to his satisfaction.That price also included 80 bucks for head gaskets.Rocky