The 192 degree thermostat is not arbitrary and the 192 temperature is their by design. In a stock 351-c testing by Ford showed that at this temperature the engine ran with the most efficiency ( including wear on internal parts like cam, bearings and rings. Lower temp range thermostats DO NOT
improve performance, but lower it. This changes with modification to the engine, but a good oil cooler will give you a better way to control engine temperatures, and not overheat.
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