How much does a head gasket cost for a 2006 chevy impala?

i bought my 2006 chevy impala in june of 2009.i let 3 mechanic check it out before i purchased it and nothing was wrong.i have a friend that said he shaved the heads and got a oil change and it cost 500 dollars. now he did this himself and he is no mechanic. then after all of this i paid him back. now i took my car to a real mechanic and he said that he could tell that nothing was done just by me popping the hood. so now im stuck with a friend that says he did something and a real mechanic saying he didn't and will come show him that he didn't. i just wanna know how much does it cost to do that?How much does a head gasket cost for a 2006 chevy impala?$500 sounds like a fair price to do head gaskets on that car , i dont know how your %26quot;real mechanic%26quot; can tell just by liftin the hood that he didnt do anything if he didnt clean everything like a shop would it really wouldnt look like the heads where done but anyways not sure if I answered you question ir not but thats my 2 cents worhHow much does a head gasket cost for a 2006 chevy impala?Are you referring to the work that your so called friend did or didn't do? First of all does your friend have a machine shop in his basement? The work that you describe would have to be done in a facility where the machines that turn or shave heads because of warpage have to be done in exact tolerances. If you pull your own heads it would probably cost about $100.00 to $150.00 a head. If the shop does all the work about two and a half times the cost I quoted you.How much does a head gasket cost for a 2006 chevy impala?About $1300 is probably the best price you'll find to do both heads at a good shop. Anything less would probably be skipping steps. If your friend actually had the heads machined, they will look brand new. As, the machine shop will completely clean the heads before and after machining.