Based on Pro Stock Motorcycle performance data, the NHRA Technical Department has made the following parity changes. 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.

S and S (must be NHRA-accepted)

Gen 1 (up to 160 cid; 60-degree angle, 2-valve, pushrod)- 635 pounds

Gen 2 (up to 160 cid; 60-degree angle, 2-valve, pushrod)- 635 pounds

Suzuki (must be NHRA-accepted)
(up to 113 cid, 2-valve)- 590 570 pounds

(up to 113 cid, 4-valve V&H Head)- 625 635 pounds
(up to 113 cid, 4-valve Monster Head)- 625 630 pounds