Road Test of Stant vs. Shewman Thermostats

[Old Henry]

Later today did a 150 mile round trip to Mirror Lake climbing up over 10,000 feet. On the way down the Shewman stats let the engine get clear down to 120° for the 30 miles coming down the mountain, 60° below their rating of 180°, the temperature that they opened when tested before installing them. So, the holes drilled in them really do defeat the purpose of a thermostat.