Re: 1966 4000 351 water pump
There are basically 2 water pumps for the V-6's, one has a threaded shaft and the other has a flange with 4 threaded holes. It is true that most of the time V-6's with air brakes use the pump with the threaded shaft, but be advised I have seen V-6's with air brakes that used the pump with the flange.
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