Blocking the front grille for racing?

[team39763]

Anybody block the front grille for racing? I've heard of it being done, but what are the drawbacks? I'm doing some front end work on my truck and I figure I could block off the front like I seen on some race cars. My truck is a RACE-ONLY vehicle, so I don't need streetability or street-legal stuff. My plan was to completely block off the front grille and put a few 1" holes in the middle to trickle just a little air through to the radiator. I have e-fans and an open engine bay(no inner fenders, cowl hood with vent). Could I get away with this? I'm looking for every little advantage I can give to my truck to be competitive with the more powerful cars/trucks at our track.