Points/Stats Schedules

National Events
Regional/Division Events
Heritage Series
Member Track Directory
Division Offices
SRAC Advisor
Competition Number/License Applications & Forms
NHRA Approved ASO's
Insurance Claim Information
Automatic Horsepower Factoring System
AHFS Request
Engine Blueprint Specifications
Indexes and Records
NHRA Accepted Products
Stock Car Classification
Tech Support Contacts
Chassis Inspector
Contingency Award Rules & Policies
Sponsor Listing & Contact Information
Contingency Sponsor Requirements
LODRS Div Contingency Sheet
Camping World Series Event Contingency Posting
Contingency Sponsor Approved Decals
W9 Form

2016 Mid Year Stock, Super Stock Horsepower Adjustments Announced

The following Stock/Super Stock horsepower changes were released June 28, 2016 produced by the Automatic Horsepower Factoring System (AHFS). This is the first of two scheduled horsepower adjustments for this year. All changes are effective June 28, 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 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.


A minor change was made this year to the method of calculating runs made at altitude tracks. In the past these runs were converted back to sea level as a part of the calculation. After input from racers and an internal review it was determined that the prior method was not as linear or consistent as the new method of just subtracting the run from the altitude corrected index.

Because the process of making Stock and Super Stock horsepower adjustments involves collecting and performing calculations on large amounts of data, it is possible to make errors. From the completion of the tech. card, to the entry of data into the timing system, to the calculations of the final data itself, errors can be made. We work very hard to minimize those errors, but they still sometimes occur. Usually when a mistake has been made one of our racers quickly points it out to us and we make the correction. Please feel free to contact Pat Cvengros via email at: pcvengros@nhra.com. regarding any questions or concerns about  horsepower adjustments.




                            Stock Horsepower Changes

Complete for 1st half rating period of 2016




Engine                 OEM         NHRA       New

Make          CID     HP            HP           HP           Years Affected


AMC            258      114           148          150          1977 Pacer


Chev           327      275           274          278          66-68 Nova


Chev           350      350           350          355          13-15 COPO


Chev           396      390           414          420          13-15 COPO


Chev           427      425           456          467          12-13 COPO


Chev           427      450           450          461          14-15 COPO


Chry            146      180           204          209          2004 PT Cruiser


Mopar          426      425           415          421          1964 Fury


Dodge         512      450           511          518          2011 Drag Pak


Ford            330      425           497          504          2010 Cobra Jet


Ford            330      450           542          549          2012 Cobra Jet





Super Stock Horsepower Changes

Complete for 1st half rating period of 2016



Engine                 OEM         NHRA     

Make          CID     HP            HP           New HP  Years Affected


Chev           350      530           530          542          14-15 COPO


GM              350      245           275          279          90-92 SS/GT FWD


Chev           350      260           283          287          94-97 SS/GT RWD


Dodge         512      450           467          473          2011 Drag Pak


Ford            302      525           544          557          2014 Cobra Jet


Ford            330      425           505          517          2008 Cobra Jet


Ford            330      435           477          488          2010 Cobra Jet


Ford            351      285           329          334          1971 SS/GT FWD


Ford            428      355           350          355          1969 SS/GT RWD