I have a 1941 chevrolet pick up with a 216 engine. Thermostat is a 160. New about 1 year ago. Radiator new 1 year ago.
I am adding antifreeze about every 3 months. I drive only on week ends no more than about 40 miles total.
There are no external leaks, and the truck does not smoke.
Temperature normal runs around 160-170 by installed gage.

Have yet to put temp gun on it to check accuracy.
Any thoughts or ideas appreciated.