I went from a lift off 6 pack hood to a bolt on 5" cowl hood and didn't see any difference in ET or MPH. Not back to back tests, but the car ran the same as it always had for the given weather conditions.
I also had trouble with the 6 pack hood lifting and looking like it was going to explode off the car at speed. No more worrying about that happening with the cowl. CHIP
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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