Try running that big 7 blade fan without a clutch at 6000 rpm or more. You will be wasting 40 horsepower if the belt stays on. A fan clutch is the next best thing to electric. Better than a flex fan. On some cars, electric look/sounds too stupid, so you need mechanical.

[img]http://i.imgur.com/boeexFms.jpg[/img]
31 Plymouth Coupe, 392 Hemi, T56 magnum
RS23J71
RS27J77
RP23J71
RO23J71
WM21J8A
I don't regret the things I've done. I only regret the things I didn't do.
"Wise men talk because they have something to say; fools because they have to say something. ~ Plato"