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radiator cold engine hot - thermostat?

MSD fixed but next chapter. I filled the cooling system with about 3.5 gals of coolant. Fired it up adjusted the timing/carb, every thing is running great. Temp is about 190 second fan is not on so I think the temp is ok. Go for a drive and engine sounds great. A bit scary with out the bulkhead in. The temp starts to climb and I get home fast an garage her. You can tell it's hot, gauge got a bit above 190. The swirl tank is not to hot but the engine is. The tube to the thermostat is also not to hot and the fluidyne is not hot at all and the hoses feel empty. The coolant was down about 1/2 gal. Well guru's sound like the thermostat? I bought a Robertshaw 333-180 and read that that was the correct one but I did not put it in because it did not look like the one I got from PI. The one from PI was in the old engine and always worked fine so I put it back in, could it have froze setting for a few months? The one with the small hole is from PI.

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