in; 13,584 cc), which was exclusive to the Sixteen and based on the GM Generation IV LS architecture.

The engine features fuel-saving Active Fuel Management "Displacement on Demand" technology,[5] which could shut down either twelve or eight of the cylinders when the full output was not needed.

The engine was said to produce a minimum of 1,000 bhp (746 kW; 1,014 PS) and at least 1,000 lb⋅ft (1,356 N⋅m) of torque[5] using no form of forced induction.

Since its unveiling there have been resurfacing rumors about a possible very limited production of an exclusive Cadillac halo model.

Ever since the Sixteen was first unveiled there have been resurfacing rumors, speculation and high hopes of automotive journalists and aficionados about a possible limited production of an exclusive Cadillac halo model, such as the Sixteen, to be the "ultimate flagship" of the brand and sit atop of the upcoming flagship, as previewed by the Ciel concept of late 2011.