Hi all, I suspect that I have a blown headgasket after doing a burnout that tapped 6k rpm for a second. Got the milkshake oil and the tapping under the hood. I've changed headgaskets before, but I've heard the 99 GT is quite different from an average GM engine, so I don't want to mess up. Can anyone tell me how much this will cost about? I was also thinking of selling it as is to a friend of mine, and buying an 05 or 06 because of the interior size.