Alternatives to elec. water pump for 4k rpms?

I made a new pulley for the water pump to slow it down. So at 4500rpm the pump thinks it spinning 3200rpm. I have had it done for over a year now and no blowen plugs. I will take some pics tonight and post them later.

Great Idea !!! Now make a under drive for the crank and see how it does
 
Alright, here is the solution I came up with. I was afraid to cut 2/5 fins off and having it be unbalanced so instead I trimmed a little off of all 5 fins.

First I took the top ring off that the napa replacement had on the end of the fins that is shown in BBD's pic below. Then I got the grinder out and trimmed all the fins back as shown in my MSPaint model below LOL. The black is obviously the original profile, and the red is the new profile. I will report back this summer after driving and pulling it a few times at 4k and see if I have any problems with the coolant pressure.

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