The following Stock/Super Stock horsepower changes were released December 19, 2013 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, 2014. 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 2^nd half rating period of 2013

 

 

 

Engine                   OEM          NHRA      New

Make          CID     HP            HP           HP           Years Affected

 

Chev           327      500           500          512          2012 COPO  Camaro

 

Chev           396      390           390          399          2013 COPO Camaro

 

Chry            146      180           199          204          2004 PT Cruiser

 

Dodge         392      375           380          385          2010 Drag Pak

 

Ford            140      145           165          168          1983 Mustang, Capri

 

Ford            281      235           263          267          2010 Cobra Jet

 

Ford            302      500           519          531          2013 Cobra Jet

 

Ford            330      450           492          504          2012 Cobra Jet

 

Ford            428      375           416          422          2010 Cobra Jet

 

 

 

 

                     Super Stock Horsepower Changes

Complete for 2^nd half rating period of 2013

 

 

Engine                   OEM          NHRA     

Make          CID     HP            HP           New HP  Years Affected

 

Chev           396      325           358          360          68-69 Chevelle

 

Chev           396      325           363          369          68-69 Camaro,nova

 

Chev           305      195-220    252          258          88-92 SS/GT

 

Chev           346      305-350    305-324  313          99-04 SS/GT

 

Chev           350      250           275          279          90-92 SS/GT

 

Chev           350      260           279          283          94-97 SS/GT

 

Dodge         426      450           450          456          09-10 Drag Pak

 

Dodge         345      305           305          312          2010 SS/GT

 

Ford            302      500           512          524          2013 Cobra Jet

 

Ford            330      450           476          487          2012 Cobra Jet

 

Ford            330      500           609          636          2010 Cobra Jet

 

Ford            330      510           588          608          2012 Cobra Jet

 

Ford            428      375           389          394          2010 Cobra Jet

 

Ford            351      330           335          340          SS/GT

 

 

 

                           Super Stock Index Changes

Class          Old Index            New Index

 

SS/DS       10.85                10.75