I'd feel pretty confident in guessing that the stock crappy headgasket is gone but still do the tests to make sure before you go ripping the head off. another quick thing to check is just run it up past normal operating temp and just see if the upper hose is hot to double check the T-stat. I have seen them go bad shortly after installation.

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!