The NHRA Technical Department has made the following parity adjustments for the NHRA Pro Mod Drag Racing Seires. These rule changes will go into effect immediately. NHRA reserves the right in the future to make additional rule changes to control performance and maintain parity in the category.

Screw Supercharger: Reduced Overdrive from 75.0 to 65.0 %

4.9 Bore Space Roots Supercharger: 2640 lbs / 14.5 % overdrive               Maximum