<VV> Air flow question

[Jim Briggs]

I'm trying to figure out if the air pressure over our LM air intakes behind the rear glass is +positive or -negative and how much.
I've looked at the pictures on AeroNed's site but they are not diffinitive. I've even tried my own rudimentary string test.
Has there been any measurement testing done out there? I'm trying to determine which way to flow the air through the 
horizontal radiator above the transaxle on my rear engine V8 project. It's obvious that with a closed engine compartment
our air cooled Vairs can "pull" enough air for cooling but I'm trying to figure out if there is significant positive pressure aiding 
the cooling fan?
 
Thanks for any help!
Jim Briggs
65 coupe & sedan
66 Corsa V8

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