Rev difference between a standard weight and lightweight flywheel

Kinda depends what you consider light, and heavy.
I ran a 13lb aluminum wheel on a small block chevy, and it revved like a die grinder. But I had 4.56s in the back, too. Probably wouldnt have worked well with 3.08s.
Change a 35 lb stocker for a 22lb light steel, you WILL notice a difference.