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"...I have three working thermostats that open in boiling water. One is a 160, two are 180's...."
When you put them in a pan of hot water, did you have the thermometer in there also so that you can see if they actually open at the advertised temp (160, 180, whatever) or did you have to run the water temp all the way up to boiling (~212) before they open?
"...Radiator has 15degrees difference in in temp and out..."
So let's say you're running the engine with no radiator cap and the thermometer is stuck in the upper tank, as your photo suggests. Since the radiator cap is so close to the upper hose neck, you should see the thermometer climb to whatever the thermostat rating is immediately after the water starts to circulate within the radiator tank. If the the circulation starts and the thermometer quickly climbs to something greater than the thermostat rating, then I would suspect a bad thermostat.
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