What part of the valve cover do you think is getting hot? The bottom left side is right by the exhaust manifold and that part of the head does heat up quickly and oil residue can smoke in that area. The thermal gun will tell the story. The only thing that might be a problem is if you installed the thermostat upside down. The larger brass temp bulb should be down. Even then if it is getting hot and the temp gauge worked before it should read hot. One other thing I have seen is caused by folks that like to gob on a lot of RTV sealer. I have seen chunks of it get loose in the cooling system and plug the small bleed opening in the thermostat. Then the air cannot escape out of the block and head when the system if refilled. Then no water can make its way up to the temp gauge or the thermostat in this case you may experience the type of problem you are indicating. This is really not to likely a issue in a Farmall because of the fairly large bypass they have. The water pump will likely get some flow going in the system anyway, at least enough to open the thermostat and purge out the air. Your external engine heater is not to likely causing your problem. Originally the places it connects are plugged anyway. In no way can it flow enough coolant compared to a radiator hose to stop proper cooling.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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