General Motors (GM) is set to enhance its position in the heavy-duty pickup market by introducing an all-new Duramax 8.3-liter turbo-diesel V8 engine in the 2027 GMC Sierra HD and Chevrolet Silverado HD models. This marks GM’s first in-house designed heavy-duty diesel engine, generating a robust 555 hp and 1,230 lb-ft of torque, catering to the majority of heavy-duty buyers who favor diesel.
To solidify its dominance, GM is expanding the DMAX plant in Brookville, Ohio, with a significant investment of $920 million aimed at increasing production capacity for this engine.
Alongside the new diesel offering, the trucks will feature electric rack-and-pinion steering, electronic brake boost, and a 412 hp 6.6-liter gasoline V8, paired with an Allison 10-speed transmission. These trucks will be capable of towing up to 20,000 lbs conventionally, or 38,000 lbs with a gooseneck hitch, with deliveries to U.S. dealers expected to start in late 2026.
Mark Dickens, Executive Chief Engineer for GM Full Size Trucks and SUVs, highlights that this new engine and the accompanying technologies reflect GM’s commitment to meet the demanding needs of heavy-duty customers. Norman Peralta, Executive Chief Engineer for Global Engine and Battery Systems, emphasizes that the new diesel engine embodies years of development and is engineered for heavy-duty applications.
For more details, visit GM’s press release.
