The NHRA’s Pro Stock class is one ruled by many limitations – each engine may spec out no larger than 500 cubic inches, while every car must go over the scales at no less than 2,350 pounds. The bodies that cover the tube-chassis underpinnings must conform to specific templates set forth by the sanctioning body, and a ‘spec’ fuel must be used.
This limits the options of the competitors by forcing them to look in places that are not obvious to find performance advantages and refine their combinations to the highest degree possible. Racers like Greg Anderson, Jason Line, Erica Enders, and Allen Johnson have an incredibly difficult job of trying to find horsepower to gain an edge over their competition. All the way back to when Bob Glidden famously covered his intake manifold and carburetors with his fire jacket after a rollover crash, secrecy has been the name of the game in Pro Stock.
Rumors started floating around last week that some competitors had been shaving their tires, removing some of the excess rubber manufactured into their slicks, and the NHRA acted decisively on Wednesday. Below is the text of their rules revision.