Possible Water Pump Trouble

345man said
is anyone outthere using the mopar performance 8 blade water pump, car cools good until you get on it hard and then have a long hill to pull up. wondering if the 8 blade pump is pushing the water to quick and if the 6 blade would maybe fix the problem? anyone had this trouble or used the 8 blade pumps?

I guess it's possible but remember your thermostat also serves the purpose as a flow orifice. You are running a thermostat right. Also make sure that your lower rad hose has the coil inside it to prevent it from collapsing at high RPM and restricting flow to the pump.

Terry