https://www.live-feeds.com/feed/gm-s-huge-8-3-liter-mongoose-diesel-for-chevy-and-gmc-s-hd-trucks-cranks-out-1230-lb-ft-of-torqueContinuously updated, source-cited coverage. https://www.live-feeds.com/feed/gm-s-huge-8-3-liter-mongoose-diesel-for-chevy-and-gmc-s-hd-trucks-cranks-out-1230-lb-ft-of-torquehttps://www.live-feeds.com/feed/gm-s-huge-8-3-liter-mongoose-diesel-for-chevy-and-gmc-s-hd-trucks-cranks-out-1230-lb-ft-of-torque#u86285Sun, 27 Sep 2026 14:50:20 +0000General Motors has announced an all-new heavy-duty diesel engine named the Mongoose. The massive 8.3-liter Duramax V8 turbo-diesel powers the upcoming 2027 Chevrolet Silverado HD and GMC Sierra HD trucks. According to published reports, the heavy-duty engine delivers an output of 555 horsepower and 1230 lb-ft of torque. General Motors stated the powertrain is designed to raise the bar for heavy-duty power, capability, and control.Why it mattersThe introduction of the 8.3-liter Mongoose diesel represents a major push into high-output powertrains for heavy-duty commercial and consumer trucks. Ge