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The 4 blade fan most often seen on Model A's was from the 4 cylinder 1933-34 and carried part number 46-8600. The '32 4 cylinder used the '31 Model A fan. This fan became the dealer replacement fan for '28 through '34 when it was introduced and can be found as such in the Green Bible. This explains why they are seen so frequently compared to the number of 4 cylinder cars produced in 1933-34. Of course there was the cheap auto parts stores 4 blade fans and later cheap reproductions. Although not as common these fans fail also which would make me use a current aluminum reproduction if given the choice. I say current because some of the early aluminum fans had quality problems. I think most of these failures occur because people have in the past turned the engine over using the fan blade. Once a crack starts it grows with time.
Charlie Stephens