If this since deleted tweet from Cosworth is legit, then yes.
https://www.roadandtrack.com/new-ca...worlds-most-powerful-naturally-aspirated-car/
https://www.roadandtrack.com/new-ca...worlds-most-powerful-naturally-aspirated-car/
Update, August 22nd, 2018, 9:30am: This post was originally published on August 21st at 3:20pm, shortly after engine builder Cosworth sent out a tweet that seemed to reveal the Aston Martin Valkyrie's horsepower figure. Shortly after, the tweet was deleted. A Cosworth spokesperson tells Road & Track that the deleted tweet "contained inaccurate information, hence its subsequent deletion." The spokesperson went on to say that the Valkyrie engine is currently being dyno-tested at Cosworth's UK facilities, and is still undergoing calibration. "Consequently, no precise figures related to the engine have been confirmed," the spokesperson told R&T.