Ok, my dad had been using my Bravada while his car was down. The other night it quit on him and had to be towed. The garage says it's head gasket and they won't change it, they say they will only change the engine and want $1900 to do that. My dad later told me that it had gotten hot a few times before. I got it towed back here and when it is running it sounds horrible and blows white smoke. I was wondering how much of a job it is to change head gaskets without pulling the engine? Also, could anyone give me a ballpark answer on what it might cost to get heads tested at a machine shop. I don't have money to be spending a lot for a garage to fix it. If I can't fix it, I'll probably just try to sell it as is.