Agpilot: I don't pretend to have all the answers, however I know my SA and 130 are original. Super A being C-113 thermosyphon, and 130 being C-123 with water pump and thermostat. Super A is the one with the more agressive pitch. Remember the agressive pitch blades don't have to clear the water pump shaft on thremosyphon tractors.
Now, LMack found two different size generator drive pulleys, maybe Maybe the fan driven pulley is different as well. He also found the more agressive fan blades wouldn't clear the water pump shaft.
By the way I don't buy your argument that water pump with thermostat would require the more agressive fan, that pump starts circulating coolant soon as the thermostat opens at 160-180F. Thermosyphon runs very close to 212F. You shut one down from heavy work and within seconds you hear boiling in the rad. I've run these ever since new, and they always worked that way. Let my SA idle for 2 min. and you'll not hear any boiling. I never hear my 130 or 140 rad boiling no matter how hot or how long they've been working full out. For that reason, I believe thermosyphon requires the more agressive fan.
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