Horsepower Adjustments – From Competitor Requests
- Dec 9, 2025
- 3 min read
The NHRA Technical Department released Horsepower changes December 9, 2025 after review and evaluation of written requests from Lucas Oil Sportsman Series competitors. All changes are effective January 1, 2026. Only those requests received by November 18, 2025 were considered during this scheduled evaluation. Any requests received after November 18, 2025 will be reviewed during the next scheduled evaluation of 2026.
Letter review is part of NHRA's commitment to evaluating input from the Sportsman racing community and is an important element of NHRA's Automatic Horsepower Factoring System. “No Change” combinations are listed so that competitors may see that requests were reviewed by the Technical Department, even though the request resulted in no change.
Requests for horsepower changes or reviews can be made here www.nhraracer.com/ahfs.asp. Requests for reviews must be received no later than November 17, 2026 to be included in the next scheduled horsepower and index review.
Stock Horsepower Changes
Engine OEM NHRA New
Make CID HP HP HP Years Affected
GM 173 112 130 125 80-85
Chev 283 270 270 245 58-61
Chev 307 200 170 165 1970
Chev 327 325 292 285 1968
Chev 327 325 292 290 1968
Chev 350 350 370 315 69-70
Chev 350 350 370 320 69-70
Chev 350 370 400 325 1969
Chev 350 370 400 330 1969
Chev 350 370 400 320 1970
Chev 350 370 400 325 1970
Mopar 318 155 250 245 78-84
Mopar 318 155 255 250 78-84
Mopar 440 375 330 325 1967
Mopar 440 375 330 330 1967
Ford 302 210 162 160 1971
Ford 429 205 340 335 1972
Olds 455 365 various 346 69-70
Olds 455 370-390 various 350 68-70
Pont 400 366 365 335 1968
Pont 400 366 365 340 1968
Pont 428 390 390 385 68-69
Pont 428 390 390 385 1969
Note: See class guide for specific details
Stock Horsepower No Changes
OEM NHRA
Make CID HP HP Years Affected
AMC 304 various various 70-79
Chev 396 325 325 1966
Dodge 426 400 439 1965
Ford 140 155 171 1986
* = no such combination listed in the class guide.
Super Stock Horsepower Changes
OEM NHRA New
Make CID HP HP HP Years Affected
AMC 360 290 280 270 1970
AMC 360 290 285 275 1970
Chev 283 245 245 240 58-61
Chev 283 270 270 240 58-61
Chev 283 250 250 245 1957
Chev 283 250 250 245 58-59
Chev 302 290 295 290 67-69
Chev 302 290 300 295 67-69
GM 350 275 289 284 92-98
Chev 350 370 400 325 1969
Chev 350 370 405 330 1969
Chev 427 425 435 429 1969
Chev 427 425 435 439 1969
Pont 364 361 356 350 2008
Mopar 318 155 245 235 1978
Mopar 318 155 250 246 1978
Mopar 426 365 305 300 1964
Mopar 426 365 305 310 1964
Mopar 426 400 460 455 64-65
Ford 227 260 230 225 11-14
Ford 281 235 223 215 2010
Ford 302 350 330 320 2014
Ford 302 380 380 325 11-14
Ford 427 410 410 400 66-67
Ford 281 235 229 225 2010
Ford 289 210 220 215 1964
Ford 289 210 230-233 215 1964
Ford 302 325 277 270 2012
Ford 302 335 335 330 2019
Ford 460 195-220 310 305 1974
Olds 455 365-400 various 360 69-70
Olds 455 370-390 various 360 68-70
Pont 400 340 350 345 1968
Pont 455 300 314 310 1972
Note: See class guide for specific details
Super Stock Horsepower No Changes
OEM NHRA
Make CID HP HP Years Affected
AMC 304 NA NA 70-79 All
Chev 265 225 230 1956 Coupe
Dodge 318 155 225 1980 Aspen
Dodge 340 275 276 1971 Demon
Pont 376 365 365 1998 Firebird
Index No Changes
Class
FGT/AA
* = no such combination listed in the class guide.
73275
