The following Stock/Super Stock horsepower changes were released December 19, 2014 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, 2015. 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 bbachelder@nhra.com.
Stock Horsepower Changes
Complete for 2nd half rating period of 2014
Engine OEM NHRA New
Make CID HP HP HP Years Affected
Chev 262 170 191 196 1996 S-10
Chev 327 500 512 519 2012 COPO
Chev 350 165 198 203 1986 Truck
Chev 350 300 341 346 95-96 Vette
Chev 350 350 350 358 13-14 COPO manual
Chev 350 530 548 555 2014 COPO
Chev 396 390 390 399 13-14 COPO manual
Chev 427 430 454 465 2014 COPO
Chev 427 450 450 456 2014 COPO manual
Dodge 242 190 170 174 87-92 Jeep
Dodge 345 305 421 427 09-10 Drag Pak
Dodge 360 275 339 349 09-10 Drag Pak
Mopar 383 280 294 298 1967 Cuda
Ford 302 139 150 152 1978 Mustang
Ford 302 350 358 363 2014 Cobra Jet
Ford 302 525 543 550 2014 Cobra Jet
Ford 330 425 505 512 2008 Cobra Jet
Ford 330 425 516 528 2012 Cobra Jet
Pont 400 330 330 338 1968 Firebird
Super Stock Horsepower Changes
Complete for 2nd half rating period of 2013
Engine OEM NHRA
Make CID HP HP New HP Years Affected
GM 305 190 235 238 1987 GT FWD
GM 305 210-215 256 262 85-86 Camaro Firebird
Chev 350 247-250 287 294 90-91 GT FWD
Chev 396 325-350 369 374 68-69 Camaro
Chev 427 450 450 461 2014 COPO manual
Dodge 512 450 450 456 2011 Drag Pak
Ford 302 525 525 537 2014 Cobra Jet
Ford 330 425 471 482 2008 Cobra Jet
Ford 330 435 435 441 2010 GT
Ford 330 450 515 527 2012 Cobra Jet
Ford 330 510 588 602 2012 Cobra Jet
Ford 429 455 455 466 2014 Cobra Jet
Super Stock Index Changes
Class Old Index New Index
SS/ES 12.2 12.15