You are all forgetting the real reason why the hemi rules - Bo and Luke Duke and the General Lee!!
(although I did read that alot of the shows cars did not actually have a hemi in them)
Hemi's rule because Hazard county was ruled by the general lee. The fords and chevys didn't stand a chance against the orange rocket because no other engine is better. Roscoe, Cletus, and even Boss Hogg himself couldn't ever catch them dang Duke boys - all because of the hemi. That is the real reason why all dragsters use a hemi.