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The mezzier pump should work fine. I tried contacting them for flow rates, etc, as it would be great for racing IF the flow rates are high enough for high hp/rpm continuous use, but they never responded.
The LS2 water pump is the same as teh LS1/LS6 EXCEPT that the thermostat is different.
please correct me (kindly of course) if I am wrong, but the way I understand it a engine driven water pump doesn't flow much H20 at idle (typically when it is needed in city driving etc.; but flows tons at higway speeds (when plenty of air is moving through the radiator).
I thought this was one of the big positives of a electric pump, you have lots of consistant flow at idle and other RPM's.