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2018 Mid Year Stock, Super Stock Horsepower Adjustments Announced

The following Stock/Super Stock horsepower changes were released July 3, 2018 produced by the Automatic Horsepower Factoring System (AHFS). This is the first of two scheduled horsepower adjustments for this year. All changes are effective July 3, 2018. 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 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.




Stock Horsepower Changes

Complete for 1st half rating period of 2018




Engine                     OEM           NHRA       New

Make           CID      HP             HP            HP            Years Affected


Dodge          360       185             279           283           1980 Mirada


Dodge          360       210             265           271           1980 D-150


Ford             302       133             151           153           1976 Mustang


Ford             302       565             573           581           2016 Cobra Jet







Super Stock Horsepower Changes

Complete for 1st half rating period of 2018



Engine                     OEM           NHRA      

Make           CID      HP             HP            New HP   Years Affected



AMC             390       340             423           433           1969 AMX

Chev            396       325-350      379           384           68-69 Camaro


GM               350       240-245      279           283           90-92 GT FWD


Ford             302       500             524           536           2013 Cobra Jet


Ford             302       565             565           573           2016 Cobra Jet


Ford             330       435             540           547           2010 Cobra Jet


Ford             330       435             441           551           2010 GT Cobra Jet