I ran the Mark VIII fan on my Procharged 540, wouldn't break 190 degrees idling with the air on in 100+ temps. I also used it on my friends 700 rwhp small block, same results. It flat out works.
Remember you'll need a 60-75 amp relay to run that, the 30 amp Bosch standard relay won't work. If you can afford it the DC controller for the fan is a very nice setup.
Jody
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