You just can't beat the nostalgic ground-pounding sound of a lumpy bumpstick and the whine of a gear drive. Even from miles away, everybody knows you are coming before you pull up to the local car ...

On the left is the gear-drive cam and its distributor drive gear, while the pair on the right are for conventional chain drive. Notice the different helix angle of the gears. See All 3 Photos Shown ...