I'd say if you run with two pullers, then USE A SHROUD!
The shroud increases the fans abilities by a LOT. So on that 100 degree day when you're stuck in traffic, you won't have any probs. Fans and shroud are behind the radiator so when not running, the air still hits the fins and allows the radiator to work normally.
Also, newer fans from Spal are flatter, and lighter, and are very nice. They'll have a fan (or pair) that'll fit your needs.
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