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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