Aston Martin Vantage Roadster brings 656bhp V8

New Vantage Roadster will dispatch 0-62mph in 3.5sec New model is one of the most powerful drop-top sports cars on sale, thanks to Mercedes-AMG-derived engine The new Aston Martin Vantage Roadster is one of the most powerful drop-top sports cars on sale following an extensive, performance-focused upgrade. With 656bhp and 590lb