
GM Unveils 8.3L 'Mongoose' Diesel to Rival Ford in 2027 HD Trucks
General Motors has teased a new 8.3-liter V8 turbo-diesel engine, codenamed 'Mongoose,' for its 2027 heavy-duty pickups. The engine is designed to replace the current 6.6-liter Duramax and compete directly with Ford's 6.7-liter Power Stroke. While specific output figures are not yet released, GM aims to match or exceed Ford's 500 horsepower and 1,200 pound-feet of torque. The new powertrain will debut in the Chevrolet Silverado HD and GMC Sierra HD, which are expected to launch before the end of 2026. This move coincides with broader updates to GM's truck lineup, including new styling cues and enhanced technology in the 1500 series.









