Pontiac Problems? Ask a Mechanic for Answers ASAP
you need to remove the heads and replace the head gaskets then torque them down to 95 degrees
going 180 is too tight and has over flattened the gaskets out you have to change the gaskets as if you leave it alone or loosen them to reset them there is a very high risk of a head gasket failure/coolant leak
they may have been over stretched and is not worth taking the chance
you can pick up a new set of head bolts at any Napa or Pep boys
how are you making out ?