A buddy of mines got an 06 lbz with 140k on it. I just saw him today and we're shootin the crap and I asked how the trucks running and he told me a head gasket went and that the stealership quoted him 6 THOUSAND to replace it! We were in the grocery store w/ the women so I didn't get all the specifics but seems to me you could do several head gaskets for 6 grand. I looked on here for some tech threads on doing it cause he wants to fix it as inexpensively as possible but found none. Has anyone here done one or know of a good place to look for info on the job? All he ever ran on the truck was a 100 hp tune and that shouldn't have caused the problem so what would besides just a poor quality gasket? Thanks- Neil.