We’re you able to find anything? I want to overdrive my water pump as well. I had to use an underdrive pulley for my crank and trigger wheel setup. Need to spin the fan faster
Unfortunately, no. Seems like the best I can find in the aftermarket is 1:1. I may be able to make a 70+ A/C wp pulley work with the outer groove on my current crank pulley. I'd just have to shim the alternator to align it.