The following Stock/Super Stock horsepower changes were released December 16, 2011 produced by the Automatic Horsepower Factoring System (AHFS). This is the second of two scheduled horsepower adjustments for this year. All changes are effective January 1, 2012. It should be noted that these changes include only results produced by the AHFS, and do not include written letters or requests. Those changes are listed separately.

            The AHFS is a program based on actual run data compiled from all available runs at NHRA national events. The data-based format provides the ability to calculate average performances for any class and/or engine combination in Stock and Super Stock. The trigger point for the system is 1.00-second or more under the respective index, and must be produced on two different occasions. Engine-combination averages and class averages are then computed and analyzed to determine if a change is warranted. The amount of change is calculated on a stepped percentage basis. Where applicable, adjustments will be effective for the specific car model or body style being evaluated. An automatic adjustment is instituted outside the two-time a year process when a 1.20 and under run is recorded during any NHRA event.

            Any comments, thoughts, or requests must be sent in writing to: National Hot Rod Association; Technical Department; attn: AHFS; P.O. Box 5555, Glendora, CA 91740; or e-mail, AHFS@nhra.com or bbachelder@nhra.com.

Stock Horsepower Changes

Complete for 2nd half rating period of 2011

Engine                          OEM             NHRA         New

Make               CID        HP                HP              HP              Years Affected

Chev               327         250                245              251              64-65 Big car

GM                  346         305/310         373              382              99-02 Camaro/Firebird

Dodge             146         220/230         241              245              2004 Neon

Dodge             225         110                142              144              77-81 Diplomat

Dodge             345         305                401              411              09-10 Drag Pak

Dodge             360         275                299              303              09-10 Drag Pak

Dodge             370         385                385              390              09-10 Drag Pak manual only

Dodge             512         450                456              467              2011 Drag Pak

Ford                 302         215                210              213              94-95 Mustang

Ford                 352         285                295              302              2010 Cobra Jet

Ford                 428         375                388              397              2010 Cobra Jet                                                       

Super Stock Horsepower Changes

Complete for 2nd half rating period of 2011

Engine                          OEM             NHRA        

Make               CID        HP                HP              New HP      Years Affected

Chev               265         200                207              211              95-96 GT only

Chev               350         247                276              283              1991 GT only

Ford                 330         425                425              435              2008 Cobra Jet

Ford                 330         435                435              441              2010 Cobra Jet

Ford                 330         500                529              536              2010 Cobra Jet

Ford                 330         500                576              589              2010 Cobra Jet

Ford                 352         285                285              289              2010 Cobra Jet

Ford                 428         375                375              380              2010 Cobra Jet

Pont                 305         145/155         250              256              79-84 GT only

Pont                 428         390                330              335              1968 GT only

Super Stock Index Changes

Class              Old Index                   New Index

SS/DS            10.90                          10.85

48723