Trying to get the biggest volume of air through my big block radiator, I'm trying to figure out which FAN would be better to run. The 7 blade and the 5 blade, both seem to have been available back in 1970 so determining which is best for the big block has me wondering. Would you go with a 18" fan with 7 blades or 5 blade? Why did GM design the difference? I believe the 5 blade design went to Yenko but not sure which is better?
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