So another thing I've been wanting to do is try out an electric cooling fan. I just ran across an Engine Masters Youtube video where they test various mechanical fans for power loss:
Clutch-style fan 7lbft of torque and 14hp @ 5500rpm!!!! (This is what's on my van)
Plastic flex-fan hideously bad 18lbft and 23hp loss!!!
Steel fan with stiff aluminum blades (non-flexy) still bad 12lbft 20hp loss.
Fixed non-clutch factory steel fan 19lbft and 30hp loss WOW.
Fixed non-clutch factory steel without shroud 18lbft and 22hp loss.
In perspective, my normal highway RPM is around 2400-2500, but the fan pulley is dramatically smaller than their pulley. That's because it is designed to run the same rotational speed @ 3000rpm (redline) as on a "regular V8" with a 5500rpm redline.
So now I'm thinking more about an electric fan...hmmm....