lincolnmatthews Posted October 11, 2021 Share Posted October 11, 2021 Hi all, installing my water pumps & notice one has 6 impellers (casting #8500E) & one has 8 impellers (#8500D). I assume the 6 is a newer unit, is it better? Should I be looking for one of these? Would it be a problem to mix, possible slight diff in temperature on one bank versus the other? Appreciate any help as I am assembling things to install engine in car. Thank you! Link to comment Share on other sites More sharing options...
lincolnmatthews Posted October 11, 2021 Author Share Posted October 11, 2021 Sorry I think I have the casting #'s switched? Link to comment Share on other sites More sharing options...
lincolnmatthews Posted October 11, 2021 Author Share Posted October 11, 2021 Well after looking in the Boos-Herrel cat I see they sell one pump for the 36-39 yrs & one for the 40-48. The later one has the 6 impellers I would assume. This unit has larger openings between the impellers which I would guess would move more water,??? Maybe someone can chime in if they know! Link to comment Share on other sites More sharing options...
19tom40 Posted October 12, 2021 Share Posted October 12, 2021 The main difference between the 38-39 and the later water pumps appears to be the shaft length. The earlier ones used a shaft 4 27/64" long and the later pump used a shaft 5" long. The parts catalog does not give the impeller count. I would think that the higher number of impellers would move more water and reduce aeration. Link to comment Share on other sites More sharing options...
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