Hi George,
Well, up until Wednesday of this week, I had a 351W style thermostat in my engine so coolant continued to circulate when things were cold. Anyway, I didn't discover I had this thermostat until it failed and I changed it out on Wednesday night. I installed the correct 351C style thermostat before I made the connection with the Weiand water pump, so now I'm not sure. Presumably some water gets past the thermostat, albiet not much. The engine warms up quickly, the thermostat opens, cools things down and closes again, things warm back up, then it opens again... It does this 3-4 times before the coolant temperature seems to equalize.
You can read about it here:
http://www.banzairunnerpantera.com/updates_thermostat.htm
Cheers!
Garth
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