"At 440,000 mine finally blew a head gasket." Only 440,000 miles and the piece of crap blew a head gasket? GM junk.At 440,000 mine finally blew a head gasket. We tore it down to the short block, still in the truck, and simply replaced everything from the heads up (except the injection pump), including the turbo, timing change, damper, rocker arms, etc. I also replaced every rubber hose under the hood I could find, being careful to use the correct hoses for things like the turbo oil return. It runs great, no issues at all. Once thing I didn't do that I wish I had, when the heads are off, replace the lifters. Removing the heads in the only way to get them out so take advantage of that. I didn't know that until after the heads were back on.