The following Stock/Super Stock horsepower changes were released December 13, 2021 produced by the Automatic Horsepower Factoring System (AHFS). This is the scheduled horsepower adjustment for this year. All changes are effective January 1, 2022. 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 pcvengros@nhra.com

 

 

 

 

 

 

 

 

 

 

 

 

Stock Horsepower Changes

Rating period of 2021

As of 12.13.2021

 

Engine                     OEM           NHRA       New

Make           CID      HP             HP            HP            Years Affected

 

Chev            207       170             180           185           00-05 Monte Carlo

 

Chev            262       170             202           205           1996 S-10

 

Chev            327       275             283           290           1968 Nova

 

Chev            350       165             230           236           1986 C-10

 

Chev            350       300             296           300           1969 Camaro

 

Chev            376       365             394           401           2015 Camaro

 

Chev            427       425             473           484           12-13 COPO

 

Mopar           135       146             171           175           1986 Omni

 

Mopar           153       150             175           179           1990 Caravan

 

Mopar           345       340             394           399           09-10 Challenger

 

Ford             302       143             143           147           1972 Maverick

 

Ford             330       425             473           484           2008 Cobra Jet

 

 

 

 

 

 

 

 

Super Stock Horsepower Changes

Rating period of 2021

As of 12.13.2021

 

 

Engine                     OEM           NHRA      

Make           CID      HP             HP            New HP   Years Affected

 

Chev            427       390             405           411           68-69 Corvette

 

Ford             315       585             585           599           2019 Cobra Jet

 

Ford             429       455             466           477           2014 Cobra Jet

 

Cadi             350       170             203           206           78-79 GT FWD

 

GM               305       185-190      247           253           86-87 GT FWD

 

GM               305       190             243           247           86-87 GT FWD

 

GM               305       190             243           247           86-87 GT RWD

 

GM               350       225             307           314           1987 GT FWD

 

GM               350       230             277           284           1988 GT FWD

 

GM               350       240-245      275           282           90-92 GT RWD

 

Ford             330       435             462           468           2010 GT RWD