there are many ways to make a car go faster, especially if your using stock, OEM type parts. As already mentioned the Pro Stock guys have lightweight cranks, rods and pistons. I'm not sure if the honda 1.8? size rod journal size is still the hot tip or not but anytime you can reduce the mass, weight and drag internally the car will end up going faster as long as you can keep it hooked up. Pro Stock motors have real big bores(not sure exactly what size now) and relatively short strokes, 3.6 maybe? And they use the lightest weight parts they can buy or make in those motor on the rotating parts If you where to make two identicle motors like a NHRA legal stocker and a legal NHRA legal super stocker and used just the short block not including the SS cam, lifters and upper end and used the stocker top end in the same car the SS short block will be faster with the stocker cam and upper end than the stocker short block will be in the same car with the same weather and same all other parts other than the short block. Now don't ask me how much differences ther are in the bob wieght bewtween those two motors, especially if it is 426 Hemi motor