https://www.live-feeds.com/feed/gm-teases-new-8-3-liter-duramax-diesel-v8-for-its-heavy-duty-trucksContinuously updated, source-cited coverage. https://www.live-feeds.com/feed/gm-teases-new-8-3-liter-duramax-diesel-v8-for-its-heavy-duty-truckshttps://www.live-feeds.com/feed/gm-teases-new-8-3-liter-duramax-diesel-v8-for-its-heavy-duty-trucks#u82745Thu, 24 Sep 2026 17:35:26 +0000General Motors has teased an all-new heavy-duty diesel engine called Mongoose for its upcoming heavy-duty trucks. Designated as an 8.3-liter Duramax diesel V8, the powerplant is slated for 2027 model year HD trucks including the Chevrolet Silverado HD and GMC Sierra HD. According to General Motors and subsequent reports, the engine targets competitor Ford and aims to deliver best-in-segment muscle with confirmed outputs of 555 horsepower and 1,230 pound-feet of torque. This heavy-duty addition brings engine design fully in-house for General Motors while expanding DMAX capacity to defend the co