I have read that 180 degrees is to cool for an engine's operating temp. Oil operates better at a higher temp and less cylinder wall wear occurs at temps above 192. The higher temp thermostat is better.
I suppose the 180 degree thermostat was championed when Peoples' Panteras had inadequate cooling capabilities and it was felt that the thermo opening earlier provided a margin of improvement. I believe it essentially a wivestale.
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