The following Stock/Super Stock horsepower changes were released December 18, 2015 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, 2016. 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 2015

 

 

 

Engine                  OEM        NHRA       New

Make          CID     HP            HP           HP           Years Affected

 

Buick           350      195           268          272          1972 GS

 

Chev           207      170           170          174          00-05 Monte Carlo

 

Chev           327      250           245          249          64-65 Chevelle

 

Chev           350      530           562          575          14-15 COPO

 

Chev           396      450           535          542          14-15 COPO

 

Mopar          340      240           299          303          72-73 Cuda

 

Mopar          360      230           265          269          93-94 Ram

 

Mopar          392      380           380          389          11-13 Challenger

 

Mopar          512      450           499          511          2011 Drag Pak

 

Ford            281      235           271          275          2010 Cobra Jet

 

Ford            302      138           141          143          1973 Maverick

 

Ford            352      285           330          338          2010 Cobra Jet

 

Ford            330      450           535          542          2012 Cobra Jet

 

Pontiac        350      170           250          254          1977 Firebird

 

 

                    Super Stock Horsepower Changes

Complete for 2^nd half rating period of 2015

 

 

Engine                 OEM         NHRA     

Make          CID     HP            HP           New HP  Years Affected

 

GM              350      275           295          299          92-98 GT FWD

 

Chev           350      530           562          575          14-15 COPO

 

Chev           427      430           496          503          1969 Corvette

 

Chev           427      450           450          461          14-15 COPO

 

Dodge         512      450           456          467          2011 Drag Pak

 

Ford            302      210           205          210          1985 Mustang

 

Ford            302      525           537          544          2014 Cobra Jet

 

Ford            351      285           324          329          1971 GT FWD

 

Ford            330      425           493          505          2008 Cobra Jet

 

Ford            330      435           466          477          2010 Cobra Jet

 

Ford            330      510           610          624          2012 Cobra Jet

 

Pontiac        350      170-200    250          254          1974 GTO