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NHRA Technical Services Department Announces the Automatic Horsepower Factoring System Will Be in Effect for the 2021 NHRA U.S. Nationals
NHRA has announced that the Automatic Horsepower Factoring system will be used during the 2021 NHRA U.S. Nationals event. All runs made by Stock and Super Stock competitors at any time during the event will count towards class averages, and will be used to trigger index or horsepower adjustments







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