So my truck went in to the dealer because of blown head gasket. I am out of warranty and will have to eat this one. Here's the deal, 6K miles ago I had the injectors replaced through warranty. I found out today that the head and head gasket looked very good. Come to find out, this thing blew because of the injector sleeve!! Is this just a coincidence or could this sleeve been popped when they did the injectors. FYI, the sleeves were not replaced at time of injector replacement. Also, according to GM, if they do pop out, you are suppose to put bead lock on them and re install. Sounds to me that this was an issue from the beginning. Please help!!