A friend of mine has a PT (not sure what year it is, I forgot to ask. non turbo) that is leaking oil at the head gasket onto the back of the block. At least thats what I assume, but I'm going to clean it up and verify tomorrow. Its a fairly new car I beleive. Its owned by a female, and the oil hasnt been changed in 16k miles before I got to it

It was 3 quarts low.
Is it possible to pull the valve cover and rockers and re-torque the head bolts and maybe fix the problem? Or does it need a new headgasket?
Are there any updated torque specs/procedures for the headgasket?