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I agree with BIG JOHN. Water pumps are for dirty engines and clogged radiators. With a clean engine you'll have plenty of cooling capacity. Even if you want to work it hard in the heat. I brush hog with my old C with no water pump. After the grill gets covered in leaves and I'm working it hard it will boil over to let me know to clean the grill. No harm done. A, B, C with no water pump will boil over when a little too hot, but not much water is lost, you don't have to stop working. When the water boils it absorbs a lot of heat making steam and that cools the engine so a little burp is good for old tractors and babies. For this reason you don't want a high pressure cap. It lets the engine get much hotter before burping. A temperature gauge put in the radiator outlet (where they go in a C) reads the lowest temperature in the system so a conventional gauge will always read cool. The IH engineers were not stupid. That is the only reliable place to measure temperature on a thermo-syphon system. The top will vary from cool to boiling based on engine load. But if you are not feeding cool enough water to the engine it will overheat. The three-color IH gauges made for the C will show a proper "RUN" range for the radiator outlet.
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