Turns out the gasket that came with the original thermostat housing was not technically the right one. There's a rubber o ring that sits underneath the thermostat, and i found that out by watching this:
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Went out and got that along with a new radiator cap. Right now i am letting some of the air out of the system, adding coolant and repeat. Temps are hovering around 210 now so i'm happy. A few more times and a test drive to confirm.
Also got the new tires mounted. I'm going to balance them at work tomorrow.
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