[408cobra]

The ls1 and ls6 are nice motors and also have the benifit of being aluminum blocks but lets be honest here as far as efficiency the US based companies are way behind european engine technology. Even the ls-6 is old school pushrod technology. BMW has been making more horsepower per cubic inch and better gas mileage than anything detroit has dreamed up. I love american V8's but I also drive an Acura tl types that gets 260hp from 3.2 litres with variable valve timing. A stock 5 liter ford made 225hp thats pretty lackluster without comparing mpg.