Oh for crying out loud. If you run a 10% underdrive pulley on the water pump, it will ALWAYS spin 10% slower than without one. That means that no matter what situation you encounter, you will have 10% less flow coming out of your water pump when compared to a standard drive. ALWAYS. That reduces your cooling capabilities across the board.
And there are other issues here, because the ratio on his pulleys is standard anyway.
