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 - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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