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We used to mount a dam just below the radiator to help with airflow through the heat exhangers on big block V8's. The area from there to the front bumper was sealed (often, by factory with a composite ply material). The fan shrouding was very carefully aligned (blades 1/2" out) and this was seen as a help in long duration HP demand scenarios. I also did this to run a hotter thermostat as well as a faster timing curve (and consequent fuel demand curve changes) so as to increase mpg.
I say all this as it was the first thought about what FORD may have been up to: improved heat exchanger air flow. If so, it's still a good idea as it ought to reduce fan on time.
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