The engines are still hand built, and it is quite a nice engine even though its a re-worked jag unit.
The output per litre is slightly better than that of any non-supercharged AMG unit at 88BHP per litre, the brand new 6.2 AMG unit is 82BHP per litre for example, however for a 4.3litre engine near 400bhp is not bad, or with a re-map its then 100BHP/litre for an NA engine which is pretty good.
I agree with Graham, having owned and tracked extensively the AMG cars (55 and 65) then Aston delivers a MUCH better driving experience on the track that no AMG (OK maybe SLK55) can match for proper racing thrills.
I had a track day at Snetterton and it was superb, there's not the straight line grunt that the AMG's have, but it certainly makes up for it in the corners and everything other than straight bits of track.
The noise and 'track experience' it creates has not been surpassed by any AMG I have owned.
This is not an AMG bashing post, just these cars are like Apples and Oranges in terms of comparison.
Plus when I was repeatedly driving past the noise meter at Snetterton and registered 108dB (limit is 102dB from memory) the marshal came over and said 'sorry you're over the noise limit Sir, but its an Aston so carry on!'.
The real competitor to the Vantage is the 911 C2S, which has similar power outputs for comparison.
Come out for a ride next time, you’re then know what I mean!