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On my Silverado, I had the grill block behind the grill (Corex sheet ziptied with 3" square reinforcing plates on the backside). When I moved it to the front of my grill, I noticed an improvement in how quickly my engine got up to temp.
I believe the reason why is that air pushing on the grill block made it deflect enough to allow a lot of air through. Moving it to the front made the air pressure force it to stay in place.
Mike
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