 Engine choices (not necessarily available on all cars in the VK range) were two versions of a 5.0-litre Holden V8 engine (replaced by the 4.9-litre V8 when Group A rules entered Australian motorsport in 1985, with the SS Group A being introduced in March 1985) and two versions of a 3.3-litre "Black" straight-six engine (essentially a refined "Blue" straight-six with slight increases in power and efficiency), the latter of which was now available with either a carburettor or fuel injection.The 3.3 EST carburettor engine was standard equipment for most VK Commodores, with the 3.3 EFI injection engine nominated as standard equipment for the Calais sedan.The EFI engine was originally not available in the station wagon, as the fuel injected model's electric fuel pump is located in the fuel tank.