"Actual Match Race" 1969 440 'Cuda vs 1973 Firebird Formula 'SD-455'

NHRA 'corrected' Horsepower Factor Changes by Year

1969 'Mopar' - 440/375 HP
1969 ........ 375
1978 ........ 366
1979 ........ 356
2008 ........ 350

1973 'Pontiac' SD-455/290 HP
1973 ........ 310
1975 ........ 340
1978 ........ 345

1973 'Pontiac' 455/250 HP
1973 ........ 290
1978 ........ 310