NHRA has approved Buell DOHC, 4-valve heads for competition in Pro Stock Motorcycle, effective immediately. Early testing produced astounding performance increases; it's rumored that Hector Arana's new combination belted out a 6.67/204 pass in less than ideal conditions.
NHRA immediately dialed back the combination, still allowing the new heads, but with some restrictions:
NHRA immediately dialed back the combination, still allowing the new heads, but with some restrictions: