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Did Ford make the cast steel fan? I have one,I just thought it was something aftermarket from the 30's,40's,50's,etc.I bead blasted it and used it.It IS a cast unit,not like the late 31 single layer fan.No seam in the back.It is very thin compared to the aluminum fans,but thicker than the original 31 single layer fan.I am running it on my truck,with what I call a tubular water pump.No packing nut,fully enclosed for the whole length of it with one grease fitting in the middle.