I have used both types of pumps , with the cast impeller & with the stamped impeller. It doesn't seem to matter to me which one I use. I get the same results with both of them. If you spend the time to clearance the cover with the impeller you won't have any problems with proper water flow. With the pumps I have NOW all I had to do was go back to square one & make sure the cover was the proper distance from the impeller & all is good. On the pump I have in my car right now which is a stamped impeller is to make sure the impeller is at between .25ths - .30ths & I have solved my cooling problems. I was running between 200-225 all the time & higher when it sat still. I hated it . I tried all the things that I was told to do but never did the fix on the pump itself. Once I did the clearancing on the impeller as I should have done in the first place I would have saved a whole lot of time & concern.
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