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2019 End of Year Stock, Super Stock Horsepower Adjustments Announced

The following Stock/Super Stock horsepower changes were released December 20, 2019 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, 2020. 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

Complete for 2nd half rating period of 2019




Engine                   OEM          NHRA      New

Make          CID     HP            HP           HP           Years Affected


Chev           262      170           199          202          1996 S-10


Chev           305      190           237          240          1987 Camaro


Pont            301      210           220          223          1980 Firebird









Super Stock Horsepower Changes

Complete for 2nd half rating period of 2019



Engine                   OEM          NHRA     

Make          CID     HP            HP           New HP  Years Affected


Chev           305      185-190    240          243          1987 GT RWD


Dodge         345      305           320          328          09-10 Drag Pak


Ford            289      210           230          233          1964 Comet


Pont            350      200           250          256          1974 GT RWD