New Horse Power Ratings

[Casey Miles]

Stock Horsepower Changes



OEM NHRA New

Make CID HP HP HP Years Affected




Buick 350 175 266 262 73-74 Apollo



Chev 454 270/365 365 360 71-72 Chevelle



Pontiac 455 250 310 306 73-74 Firebird



Olds 455 380-390 371 362 68-69 Hurst






Stock Horsepower No Changes


OEM NHRA


Make CID HP HP Years Affected




Buick 350 155 240 77-79 Regal



GM 173 107/112 135 82-84 Camaro/Firebird



Chev 265 180 205 1955



GM 305 215 258 85-86 Camaro/Firebird



Chev 350 160/190 275 78-80 Camaro



Chev 350 245 310 73-74 Camaro



Chev 364 400 391 05-07 Corvette



Chev 396 375 ??? incomplete request



Chev 396 325 325 1968 Camaro



Chev 454 425 420 1971 Chevelle



Chev 454 390 415 1970 Corvette



Mopar 361 305 270 61-62 B bodies



Mopar 383 335 300 68-70 Challenger



Mopar 440 375 ??? incomplete request



Mopar 440 390 417 70-71 B bodies



Ford 302 225 215 89-92 Mustang



Ford 302 205 220 1993 Mustang





Pontiac 455 360 350 1970 GTO

Super Stock Horsepower Changes




OEM NHRA New

Make CID HP HP HP Years Affected


Chev 283 220 238 235 65-66 Big car



Chev 350 295/300 322 317 67-69 Camaro



Chev 454 425 475 469 71 Corvette



Ford 281 235 235 232 2010 Mustang






Super Stock Horsepower No Changes


OEM NHRA


Make CID HP HP Years Affected




Chev 427 430 476 1969 Camaro



Chev 454 390 415 1970 Corvette



Chev 350 295 327 1969 SS/GT no such combo



Chev 350 300 327 1969 SS/GT truck

no such combo



Chev 350 300 322 67-70 SS/GT



Mopar 383 ??? ??? 63-67 B Bodies incomplete request



Mopar 426 ??? 450 64-65 Coronet incomplete request

Mopar 488 400 425 93-98 Viper





Olds 350 170 255 77-80 Cutlass