[FED 387]

to answer your question look for a book by Herb Adams on chassis--- he explains in great detail the difference between rotational and static weights and the ET/MPH/HP advantages in going to lighter weight items versus a heavier weight item ---performance wise he breaks it down into static weight-- rotational engine weight-- and rear axle rotational weight ---and the performance gains that can be achieved by using lighter weight components ---This should answer any questions you might have--- educational reading--FED 387