Nicknamed the “baby Duramax,” the new LZ0 is essentially the second generation of GM’s 3.0L turbodiesel engine, bringing with it enhanced performance and efficiency. Output is rated at 305 ...

It's good for 401 horsepower and 464 lb-ft of torque. Optional is the 6.6-liter Duramax V8 turbo-diesel, nudging power up to 470 hp, but more importantly giving torque a massive shove to 975 lb-ft.