Thanks Doug. I measured the coolant temp after running it for a few miles this morning: 155. I guess I'm gonna have to block off the bypass hose and see what happens.
Btw, ttodd, the lip inside the thermostat neck is too large for a standard-sized (or at least what I'm used to) thermostat. We had to measure the one I pulled out to match it up with something of the same diameter.
