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I just wrote an answer and lost it so here's a quike reply. Thermostats don't cool these engines, just make them run hotter. There are no stats made that will work in 32 to 48 engines with original or Skips pumps because they don't have a large enough opening and restrict the water flow. On 49 to 53 engines prestone #330-160 which have large openings will work all year even in hot weather. Early original stats fit in the hoses and had larger openings but are subject to failure. The brass bellows work harden and split. Stats won't work with the original or Skips 32-48 pumps in warm weather, in winter yes but not when it's hot. The original impellers are paddle wheels slipping and spinning stirring in a lot of air and not able to force enough water through the radiator.
41 thanks for your time and effert in helping support not my claims but the actual improved cooling results these pumps have provided to 1,000s of others. These old Fords in the stock configuration are all the same and the improvements work on all as long as instructions are followed, the system cleaned and the radiator is in reasonable condition. A few people had problems and called Skip and the problem was found and resolved. Grease in the 32 to 36 engine can be a problem. These pumps should not be greased like king pins, just a few shots once a year of a low melting temperature grease. High temperature 500 degree grease pumped in the cooling system will coat and plug the tubes and never melt. Low temp grease melts into a heavy oil and saturates the oil lite bushings. The shaft does not run against the bushings but is supported all the way around in a film of oil never touching each other. 20 % of all 32 to 36 pumps are cracked from the grease pressure from adding too much. Skips welds them and they are like new. Attached is a picture of a cracked pump. G.M.