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parachute
I would not be concerned about a parachute effect.The leading-edge radii away from the grille area will prevent any flow separation.You will have a bubble of stagnant air in front of the blocked area but it won't really compromise drag.-------------------- I would recommend that you do a temporary block and first make sure you don't overheat.I never blocked either the upper or lower openings but rather had a nose with internal ducting which limited the "grill" opening,but once past there,the air was free to enter the original grill openings behind the new nose,both upper and lower.------------------------ The only time she ran hot was at wide-open-throttle for six miles during one summer.
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