The $3.3 million Aston Martin Valkyrie is one of the most ambitious hypercar projects in recent memory, a moonshot of a machine that's intended to herald in the next chapter for the storied British marquee. It's basically a street-legal Le Mans prototype, and after teasing us with a mysteriously deleted tweet, engine supplier Cosworth has finally confirmed the Valkyrie will have a powertrain to match: a naturally-aspirated V-12 in the neighborhood of 1,100 horsepower, making it the most powerful such engine ever used in a road car.