My heads are the deciding factor! I already have a set of 84cc eddy rpm heads. 470 is about as big as a stock port window will support efficiently. That and is a better bore to stroke ratio. I also like the 470 because the bob weight is nice and lite. I would just do a 451 but my dad has one and I gotta go bigger! I want my dart to go 10.00 on pump gas. Driving to the track and with a 17" rim. I know it's a very lofty goal but god damn would that be some bragging rights
