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If the ERA fans are the original type, approx 10" diameter unshrouded aluminum pusher fans, they're more ornamental than functional.
Better to ditch the flex fan, and use a pair of good electric puller fans in a shroud which fits your radiator properly.
Use the largest fans that will fit properly.
I have both, the original type and two pullers behind the radiator. My 12.5: 427 will sit in traffic in extremely hot weather literally forever. I've never seen the temp exceed 210* with a 180* thermostat, and the fan controller set to turn on around 190*.
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David
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