How much should it cost to fix a blown head gasket on a 1986 GMC Sierra?

I can answer you this way. I had a buddy at work have his replaced. He has a 1985 F-150 It cost him 600 hundred and some change. He did get some hoses and stuff like that replaced though. Now on the other hand, my step-dad had his replaced on his 1999 F-150 and it was gonna cost almost 1200 bucks. Luckly we realized that he had a month left on his extended warranty. It was the only time he had to use it. Of course I am sure that it depends where you live. Hope this helps you some. Brad.