Which thermostat | MG MGB Technical | MG-Cars.net
I recommend a 195ºF thermostat -- that's what I use year-round. You want to run the engine as hot as is practicable for the best longevity, efficiency, and power. Older engines were often fitted, I believe, with cooler thermostats in an effort to keep the oils of the day from breaking down due to the heat.
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