First of all, after market pumps, particularly those with metal impellers, are a bad idea. Experience has shown they are not reliable, plus when the bearing goes (and it will) the metal impeller will start to chew up the engine case; this is why the OEM pump is a composite style impeller design.
No one rebuilds water pumps these days, simply is not cost effective.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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