[FlatheadTed]

The statement . So, the holes drilled in them really do defeat the purpose of a thermostat I go along with .The idea of a thermostat is it opens and shuts to maintain and maximise working tempt ,From my experience you only need to drill one hole in it to screw up its function ,Ted

Originally Posted by 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.