Just a side note after reading the spec for this years 911 Carrera S:
3.8 litres
102.0mm x 77.5 bore x stroke
12.5:1 compression ratio
400hp @7400 rpm
325 lb-ft @ 5600 rpm
direct injection
Vario Cam Plus (timing and lift)
"Resonance intake manifold"
Hard to beat numbers. 116 Nm / litre specific peak torque and still 101 Nm / litre @ 7400 rpm (peak hp revs).
Close to BAT for a production engine of this size today.
Tapani