FWIW...I used to run a six pack hood on my cuda. It ran about a tenth quicker and 1 mph faster sealed than it did unsealed. I switched to a 5" cowl hood, unsealed, and it ran the same as the sealed six pack hood. This was on a combo that I'd run for years. I have experimented w/ sealing the cowl hood to the carb but haven't seen anything really. ![](/ubbthreads/images/graemlins/Twocents.gif)
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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