Thanks Jerry...The one I had lightened actually broke the center hub from the outer flywheel...Had a stock one lying around and simply threw that one on...Like I said I really didn't notice any difference.
That's actually a common problem for these flywheels once you start adding power. Every engine i've seen modded that didnt have the flywheel's hub weld nuked shorty after.
I know of the a few small hub lighten flywheels that were welded that havent had any problems. I believe the lighten large hub flywheels still weigh more than stock small hub ones. Grkguy posted a comparison on this site once.