is there a h.p. gain with a four blade fan over a six blade??

[hillbilly21]

is there any advantage to a four blade fan instead of a six blade on a 602 crate??

[jason29a]

6 blade

I think the 6 blade is better for HP... The four blade pulls alot of air. We havent had any cooling issues at all with the six blade. I have always ran a shoud.

[1Blacksheep]

Old GM 4 Blade takes more power to turn than anything short of a Bi-plane prop . Dyno guys can testify here. It will suck enough air to sound like an F-4u comin in for a strafe run. Well maybe not that bad.