Rev limit rules were due to the idea new teams could not afford valve train replacement intervals needed when turning higher rpm. I suspect the ability to turn big rpm was great at Denver. Gear and turn it til it breathes enough air to make power.
Same thing I heard. From what I can tell, it didn't do any good. It's so bad right now, Shane Grey and his DAD are dragging out cars to make sure Indy has a full field.
