The stock setup worked fine. The engine idles at 1000 rpm and I had the pump under driven by a good 25%. So that puts the fan and pump turning at 750 rpm. Moroso claims the electric motor spins at 2600 under load. With the larger pulley I used on the motor, it means I’ll be turning the pump and fan at 1300 rpm. Even if it only turns it at 1000 that is still 250 rpm faster than before. The fan is about an inch shorter than stock but is 6 blades instead of 5. I don’t see a problem but we’ll find out in a about 6 weeks.