I'm running a Mr. Gasket 180 thermostat which I believe allows a small flow through it all the time. I have a four row OEM radiator combined with my 350 block for a total coolant capacity of 22.5 quarts. With ambient temps below 70 degrees, my operating temperature on the highway is about 165, and 155 in town.
Texas summertime temperatures bring the engine temps up to the 180 thermostat rating in the city, but I run 210-220 on the highway when it's 90 plus degrees outside.
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