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Originally Posted by meknized

just out of curiosity, wouldn't the lighter weight get the engine spinning faster though, enough to pull right past the low end loss?

There are certain set-ups were it would. 8000rpm low geared race cars.

I researched this topic very heavily last year and asked the opinions of some very smart guys and they all said I would run slower.

I then Googled the hell out of results for light weight flywheels and I found an article that totaly made me against doing it. I found a post were a guy built his motor with a lightweight flywheel and was unhappy with his 1/4 mile times. Thinking it may be the lightweight flywheel he reinstalled his stock flywheel and cut a much better 60ft and picked up 2 mph cause the rpms didnt fall so bad betwen shifts.