Holden Gen IV 6.0L V8. Not really used here in the states till now. Has Displacement on Demand, and 362hp. Bit different from the LS2
Version without DoD aka the L98 has 391hp.
Theres also a Vortec L76 which is a Truck engine, but it only produces 355hp but has variable cam phasing (while still an ohv engine), not the same engine thats in this G8. Theres also a Vortec L98 aka the 6200, which is found in the newer Escalades and Denalis, which does 403hp, again with VCP. But not found in cars.