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  1. Big Block Clutch Fan Blade - 5 or 7 blade?

    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"...