[Mike Carr]

Certain combinations have received HP adjustments over the years from NHRA, either lower or higher than factory, based on past performance. It gets rediculous at times, though, factoring by body type, transmission, hood etc. Example, a 1999-2002 LS-1 may have a different rating in different cars based on year of car, ram air vs flat hood, stick vs auto, whatever combination ran fast enough to "trigger" the HP evaluation. A 1966 Nova 283 may be rated 223 and a 1966 Belair/Biscayne 283 may be 226, because a racer ran fast with a "big" car.