[CoupedUp]

Took out the T-Stat and found a black piece of rubber stuck in the thermostat - probably got in there from the past work of taking the intake manifold and heads off - maybe even a seal internal to the thermostat itself (it was a high-buck t-stat with the wax used to open it for more precision, etc.). Will go get a nice cheap one from NAPA and get my a$$ back on the road (I hope).

Doug