The 1966 427/425 water pump is mounted against the block on the passenger side with one hex head bolt and one bolt that has a stud protruding from it. What is the stud for and is it mounted on the outside mounting hole - i.e. the one closest to the inner fender. Also - the Judging manual calls for a flat rear plate on the back of the water pump - however I have seen many that have a flange edge. Are both plates correct depending upon production dates?
66 427 Water Pump Bolt & Flange
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