Performance engine builders are always looking at changes they can make that will give their engine an edge over the competition. Rod ratio is one of those factors that may make difference. Changing the length of the rods with respect to the stroke of the crankshaft offers some advantages in certain situations, and may allow the same number of cubic inches to deliver a little more power or a little longer ring life (take your pick). But experts disagree as to whether or not changing rod ratios really makes that much difference.