5/18/2021

As the result of runs under the Automatic Horsepower Factoring System (AHFS) 1.20-second under policy at the NHRA National event, the following changes have been made.

The horsepower rating for 1978 GM, entries with the 305 cubic inch engine and a factory rating of 145 currently rated at 174, has been increased by ten horsepower, to 184 horsepower: for Stock Eliminator.

NHRA's 2021 Automatic Horsepower Factoring System outlines that any run of 1.20-seconds or more under the index will receive an immediate index decrease or horsepower increase. These changes are effective May 18, 2021.