Cadillac Cien's 7.5-litre, V12 powerplant, which is visible through a clear window in the decklid, is a new concept engine from GM Powertrain named the Northstar XV12. The all-aluminum, dual overhead cam (DOHC) four-valve V12 engine generates 750 horsepower and 450 lb.-ft. of torque, yet it meets the packaging requirements and fuel economy standards of a V8.
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