dual water pump pulley?

[tdw6974]

http://atkinsrotary.com/store/86-88-...26-15-131.html

Glen, finally got to point ordered one and got it is about 3 3/4 " in Diameter vrs the single groove water pump pulley that was on before is about 5 1/8" so if I have theory correct the smaller dual pulley will turn the pimp faster?? We run a gutted thermostat with bypass plugged. I wonder if smaller pulley cause cavitation? Hope you and family are surviving the winter!