Run it untill it starts to overheat then feel the radiator hoses and make sure they both are pretty hot. If the one doesn't feel warm then its thermo for sure. I could even be headgasket.
I have had the same issue before in my old SOHC and even though it didn't smoke or show any in the oil, it was still the headgasket causing it to not flow and eat it all away causing it to overheat.
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