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Hi Hermie,
I think what we need to worry about is drag -- we do not have enough lift at normal speeds to really worry about, IMO.
An upper grill block will reduce drag, and probably reduce lift; as I said before.
You should try to find the Hucho book at a university library -- I borrowed a copy from MIT (via my wife who is a librarian). It'll knock your socks off with the sheer volume of detailed info about vehicle aerodynamics.
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