I have a 5" tall Glasstek cowl hood on my '70 cuda. It is a very nice quality bolt on hood...been on the car since 2003. I haven't weighed it, but I'd say it might save 25 lbs. from the stock dual scoop hood. Just a guess.
It is definitely no lightweight piece. Used to have a piece of crap MAS lift off 6 pack hood on the car and it was WAYYYY lighter. Like I said though, it was a flimsy piece of crap.


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