Points/Stats Schedules







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

2017 End of Year Stock, Super Stock Horsepower Adjustments Announced

The following Stock/Super Stock horsepower changes were released December 22, 2017 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, 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 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 2017

 

 

 

Engine                     OEM           NHRA       New

Make           CID      HP             HP            HP            Years Affected

 

Chev            327       250             251           255           1965 Impala

 

Chev            350       350             372           377           13-15 COPO

 

Chev            427       425             467           473           12-13 COPO

 

Chev            427       450             472           483           14-15 COPO

 

Chry             146       180             209           214           2004 PT Cruiser

 

Mopar           273       180             171           174           65-67 Belvedere

 

Dodge          345       305             342           347           09-10 Drag Pak

 

Dodge          426       450             490           497           09-10 Drag Pak

 

Ford             302       139             139           141           1978 Fairmaont

 

Ford             302       350             363           372           2014 Cobra Jet

 

Ford             302       350             383           388           2013 Cobra Jet

 

Ford             302       525             563           571           2014 Cobra Jet

 

Ford             302       565             565           573           2016 Cobra Jet

 

Ford             330       435             504           516           2010 Cobra Jet

 

Ford             352       285             361           370           2010 Cobra Jet

 

Olds              350       200             254           258           1972 Cutlass

 

 

 

 

 

Super Stock Horsepower Changes

Complete for 2nd half rating period of 2017

 

 

Engine                     OEM           NHRA      

Make           CID      HP             HP            New HP   Years Affected

 

GM               305       150-200      259           263           83-87 Camaro/Firebird

 

Chev            350       530             583           597           14-15 COPO

 

Dodge          345       305             312           320           09-10 Drag Pak

 

Dodge          426       450             462           468           09-10 Drag Pak

 

Ford             302       575             575           583           2016 Cobra Jet

 

Ford             330       435             528           540           2010 Cobra Jet

 

Ford             352       285             285           289           2010 Cobra Jet

 

Pont             400       200             285           290           1974 GT/RWD*

 

 

 

*= correction to match 1974 400 225/290








RM