Overview

• Engine output will increase from 670 to 750 horsepower at ovals under 1.5 miles and at all road courses starting in 2026.
• NASCAR listed 21 affected events out of 38, including Phoenix, Martinsville, Bristol, Circuit of the Americas, Watkins Glen, Sonoma and the Charlotte Roval.
• Leaders framed the move as a stakeholder-driven decision, with John Probst highlighting input from drivers, teams, manufacturers and broadcast partners.
• Steve O’Donnell said going beyond 750 horsepower would add roughly $40–50 million in industry costs, leading officials to cap the change at that level.
• An offseason test at North Wilkesboro with teams and Goodyear will evaluate tire compounds and help align aero and braking for the higher power package.