I guess the beef I have with that idea is a 440 with heavy forged TRW's will, in neutral, rev up from idle to 6000rpm in a fraction of a second. Astronomically faster than it will ever accelerate the car. If that's the case would lightweight internals make a difference on ET at the track? I don't have any practical experience to say yes or no but I would sure be interested if anyone knows of an article where someone built an engine with heavy pistons, ran it at the track then swapped in identical but lightweight guts and ran it again.

I'm sure there is a rate of vehicle acceleration that would be equivalent in terms of energy consumed to that required to accelerate the internals but that rate could be something imperceptible.