The all-new 6.6-liter LP5 Duramax turbo-diesel under the Sierra Denali 3500 hood is one of the strongest engines on the road in a heavy-duty pickup, with a factory rating of 445 horsepower (tops ...

New Duramax combined with interior sound suppression 'should put GM's marquee heavy-duty pickup on the radar of anyone who tows big trailers long distances’ PickupTrucks.com The all-new 6.6 ...

GM has yet to announce its new 6.6-liter Duramax L5P Turbo-Diesel ... Ford’s 6.7L PowerStroke Turbo Diesel V-8 in the 2017 F-Series Super Duty is rated at a whopping 440 horses @ 2,800 RPM and ...

Internally referred to as LP5, the model year 2017 Duramax V8 is a lot more muscly than the model year 2016 powerplant, which offers 397 horsepower at 3,000 rpm and 765 lb-ft (1,037 Nm) at 1,600 rpm.

Our tester came with the familiar LP5 Duramax powerhouse, good for 445 horses and 910 ft-lbs of torque, and bolted to a freshly revamped and Allison-badged 10L1000 10-speed automatic transmission.

In contrast, Chevy offers a 6.6-liter Duramax Turbo Diesel V8 on its Silverado HD models that produces 470 horsepower and ...

Those looking for more pulling power can opt for the available 6.6-liter Duramax turbo-diesel V8. It makes 470 horsepower, and more importantly, a massive 975 pound-feet of torque at just 1,600 rpm.

In contrast, Chevy offers a 6.6-liter Duramax Turbo Diesel V8 on its Silverado HD models that produces 470 horsepower and torque at 975-pound feet.