Hello Hugh: I might not agree that the newer fans with water pump would have less pitch. With a thermostat the water flow is stopped untill it is hot enough and then released and forced quicker through the cooling fins and back into the block in a shorter time... therefore needing a faster air flow for the shorter time that the hotter water was being cooled. I'd take the odds that more pitch for more air flow was for the later water pump and thermostat controlled system.. But the best answer is the parts number for early and very late units.. The later 123's were pumping more HP so cooling needs probably higher needing more pitch on fan also? Take care.. Sorta fun to try and guess why a certain thing was done.. ag
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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