Chase Briscoe’s No. 14 Stewart-Haas Racing team has been issued the strictest penalty in the NASCAR rule book for an infraction with the Next Gen car.

Both Briscoe and the No. 14 team were docked 120 points and 25 playoff points Wednesday. Johnny Klausmeier, Briscoe’s crew chief, has been suspended for the next six NASCAR Cup Series races and fined $250,000.

NASCAR found a counterfeit part on Briscoe’s Ford Mustang. The sections of the rule book cited included the underwing and engine panel, and the infraction found on Briscoe’s car pertained to an engine panel and counterfeit NACA duct.

“When we bring cars post-race to the R&D Center, they are completely stripped down to basically nuts, bolts, washer laid out on the floor,” NASCAR senior vice president of competition Elton Sawyer said. “The engine panel NACA, which is basically under the engine of the car, and the NACA duct, which allows air to travel through the NACA.

“(To) back up through the development process of the Next Gen car, we basically put an opening in the windshield as well as slots in the back glass and a NACA duct in the engine panel to allow air to get in areas of the car to help keep the car cool. So, it’s a single-sourced part that you cannot fabricate, you cannot mess with, you cannot counterfeit, and we’ve been very clear with that.”