Does A Big CI Stroked SB get to a point where It is hard to keep cool?

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I was in the shop this am and took a couple photos, nothing fancy to cool mine. Since the grille opening is pretty small, I did add a couple openings in the fiberglass bumper and a small scoop to pick up air from under the bumper. Was it necessary? I don't know. BTW the crank pulley is only 5".
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My 408 (590HP) got a four core Champion radiator, dual electric fans and Stay Frosty coolant. That keeps it at 190 ~ when the fans are on.
 
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