GLENDORA, Calif. -- Today NHRA announced changes to the Pro Stock Motorcycle category. For 2013, Harley-Davidson and Buell will both be allowed a maximum 160-cubic inch displacement (cid), for a 60-degree, two-valve, pushrod engine. Minimum weight for both motorcycles will be set at 625 pounds. The four-valve Harley-Davidson engine combination will no longer be allowed. Suzuki will still have a maximum of 107-cid, for a two-valve engine. Minimum weight on the Suzuki will be 595 pounds. NHRA also will discontinue the four-valve option on the Suzuki motorcycle.

In the interim, NHRA announced a minimum weight increase of 10 pounds for Harley-Davidson competitors in the Pro Stock Motorcycle class. The change will be in effect at this weekend’s 27th annual AAA Texas NHRA Fall Nationals at the Texas Motorplex in Dallas. The new minimum weight for Harley-Davidson motorcycles will be 670 pounds.

“We have been working on a long-term solution for the Pro Stock Motorcycle class for the last several months,” said Glen Gray, vice president of technical operations, NHRA. “Today’s announcement is part of our ongoing effort to provide great side-by-side racing for NHRA fans.”

Headquartered in Glendora, Calif., NHRA is the primary sanctioning body for the sport of drag racing in the United States. NHRA presents 23 national events featuring the NHRA Full Throttle Drag Racing Series, NHRA Lucas Oil Drag Racing Series and NHRA Pro Mod Drag Racing Series presented by ProCare Rx. NHRA provides competition opportunities for drivers of all levels in the NHRA Summit Racing Series and the NHRA Drags: Street Legal Style presented by AAA. NHRA also offers the Jr. Drag Racing League for youth ages 8 to 17. In addition, NHRA owns and operates five racing facilities: Atlanta Dragway in Georgia; Auto-Plus Raceway at Gainesville in Florida; National Trail Raceway in Ohio; Lucas Oil Raceway at Indianapolis; and Auto Club Raceway at Pomona in Southern California. For more information, log on to NHRA.com, or visit the official NHRA pages on Facebook, YouTube and Twitter.