* 6.0L Vortec V8: This was the standard engine, producing 360 horsepower and 380 lb-ft of torque.
* 6.6L Duramax V8 Turbo Diesel: This was an optional engine, producing 397 horsepower and 765 lb-ft of torque.
It's important to note that the specific engine in your 2011 GMC Sierra 2500HD depends on the trim level and the options selected by the original owner. You can confirm which engine is in your specific truck by checking the VIN or your vehicle's documentation.
