[Bob Gullett]

From NHRA site.
By way of and through input from the SRAC and sportsman racers, for the first time at the Mac Tools U.S. Nationals Stock and Super Stock Class Eliminations will be placed on a ladder. Ladders will be generated as a result of the qualifying runs made prior to the first round of class eliminations. Competitors who have not made a qualifying run before the first round of class eliminations will be placed on the bottom of their class ladder.

For the Mac Tools U.S. Nationals it is important that Stock and Super Stock competitors listen to all announcements. Due to a high volume of cars, classes will be called in groups to help expedite pairing.