Thermostat has only one simple function: Maintain the coolant temp at a specified temperature, by modulating (not turning on and off) coolant flow.
In theory, a system with a 120° stat, should operate at 120° and one with a 250° stat should operate at 250°. In practice, a properly designed system, that is in good repair, will follow that theory.
If, during warm up, the stat does not open, coolant flow will be inadequate and overheating will result. If, during cool down, the stat did not close, coolant flow would be excessive and the system would not reach the desired operating temp.
Having said that: '56 Olds had a well designed cooling system.
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Originally Posted by Steeb
........ let it idle in the driveway for 20 minutes or even drive it around town ........
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What ambient temps? What does it do at sustained highway speeds?
Quote:
Originally Posted by Steeb
........ The PO told me he put in a 160 degree thermostat ........
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Take it out (if there is one) put it in a pan of "lukewarm" water with suitable thermometer and add heat. If it starts to open before 160° and is fully open just after 160° the system should run at about 160°.
I think you will find that it does not open.
Norm