The NHRA Technical Department has released the latest version of the 2021 NHRA Hot Rod Heritage Racing Series Rulebook Supplement. The changes made will come into effect January 1, 2022 and impact A/Fuel, Nostalgia Funny Car and Nostalgia Top Fuel and pertain to helmet removal system and protective equipment requirements. The 2021 NHRA Hot Rod Heritage Racing Series Rulebook Supplement can be found under the Rules section of NHRARacer.com.