water pump question

Get a remanufactored or new unit from Auto-Zone with a lifetime warranty, unless you have a gazillion $$$ in your engine.

I don't recommend a high-flow pump unless you have a three core radiator with more coolant capacity. If it's pushing too much volume, the coolant mix won't stay in the radiator long enough to get cool. JMHO. FWIW, I tried this with the Cobra overdrive wp pulley AND the a high flow pump.... It blew off the upper radiator hose on the first whack of the throttle, and spewed water everywhere. LOL Gotta love cast iron heads...

i also am not a fan of high flow pumps. if a new one is cheap, go for it (i am also not a huge fan of reman'd units, but i think it is luck of the draw with about any pump). Stewart makes nice pumps and they are not too much $$, IIRC.

i would really want a real gauge first. who knows what you are really running at. water pumps generally dont fail or lost that that much performance (impeller shaft breaks are rare).

my two cents. good luck.