Old Mechanic - just note on terminology: a radiator block is different (and less aerodynamically effective) than a grille block. A grille block keeps excess air from entering the engine compartment, a radiator block lets it in, and only keeps it from going through the radiator (ie. cardboard up against the fins).
Quote:
Originally Posted by JonnyG
The lower grille takes up much more area, so I voted for blocking that (B)
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If you hold the total area covered constant, blocking the upper + part of the lower would likely be better. (Not a poll option , as Robert pointed out!)
Air flow that's above the stagnation point is better sent over the car rather than through the top opening and into engine compartment, where it ultimately ends up underneath the car.