The Cadillac Sixteen is a concept car first developed and presented by Cadillac in 2003.
The vehicle is equipped with a Cadillac proprietary-developed aluminum 32-valve V16 engine displacing 13.6 liters (829 cu. in; 13,584 cc), which was exclusive to the Sixteen and based on the GM Generation IV LS architecture.[4] It is mated to a four-speed, electronically controlled, automatic transmission driving the rear wheels. 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.[6] The V16 was capable of 16.65 mpg under normal conditions. The engine was said to produce a minimum of 1000 bhp and at least 1000 lbft of torque[5] using no form of forced induction. The car itself weighs about 5005 lb.