[round_midnight]

New head bolts were used and torqued to the builder's specs (with a torque wrench). I used moly lube on the threads and tightened them in three stages: 85 ft-lb, 95 ft-lb, and then 105 ft-lb. I tightened them in a pattern from the center to the ends.

I don't know how long the problem has been going on, but probably for a few hundred miles. It has gotten pretty hot (220-230 deg. F) on a couple of occasions when I didn't realize the coolant was low. I'm thinking those occasions were after the gasket started leaking and probably just made it worse, but I can't be sure.