The new 4.7-litre unit boosts power by 11% over the previous 4.3-litre engine. The new engine provides 420bhp and allows the car to boost from 0-62mph in 4.7 seconds and then on to a top speed of 180pmh.
Other changes include revised dynamics to take advantage of increased power and torque availability, improved Sportshift transmission software and a new sports suspension option.
Inside, the changes include a new centre console and revised switchgear. External enhancements include a new range of standard and optional 19-inch alloy wheels.
Dr Ulrich Bez, Aston Martin chief executive officer, said: "The V8 Vantage is now the most successful Aston Martin in our history and we are confident these changes will continue its appeal and driving enjoyment for both new and existing customers."