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 hp (tops in its class) and 910 lb.-ft. of torque (second place in its class). Combined with a well-appointed interior and sound levels rivaling a library, GM's marquee full-size heavy-duty pickup should be on the radar of anyone who tows big trailers long distances.
Denali trim is undeniably the flagship of the GM heavy-duty pickup lineup when it comes to style and luxury, but it's the new 6.6-liter V-8 Duramax LP5 diesel engine that will be the attention grabber for anyone thinking of stepping into a one of GM's 2017 HDs, be it a GMC or a Chevrolet at any trim level.
