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I had a similar issue with my 65' Belvedere, turns out the brand new thermostat I put in was not functioning properly. I diagnosed by putting the thermostat in a pot of water and watching the action as the water heated up.

This is a "Thermal" clutch it is supposed to engage more as it heats up.

First the car specs: 1965 Belvedere II, 383 mild mod, 3 core radiator with a shroud. I'm running a Hayden 2765 fan clutch with the 5 blade Mopar Performance fan, 180 degree thermostat and high volume water pump., it seems to not be working properly. At 75 degree air temp the coolant temp will...