[REVISION HISTORY]

General Motors engine development and diesel expansion

Updated 5 times since CLSTR started tracking revisions of this situation.

What changed

2026-09-28 02:23 UTC → 2026-09-29 12:14 UTC · added ~~removed~~

General Motors has announced significant updates to its internal combustion engine lineup, specifically targeting the pickup truck market. Initially, the company unveiled a sixth-generation small-block V8 engine family for the 2027 Chevrolet Silverado 1500 and GMC Sierra 1500. This lineup includes a 5.7-liter L76 and a 6.6-liter L78, the latter being described as the “most powerful naturally aspirated V8 in its class.” GM is also emphasizing diesel efficiency, highlighting a 3.0-liter diesel engine capable of highway ranges exceeding 900 miles. Following these announcements, GM expanded its diesel offerings with the introduction of the 8.3-liter V8 turbodiesel engine, nicknamed the ~~‘Mongoose’.~~ ‘Mongoose’ or ‘Mungos’. This engine is intended for the heavy-duty segment, specifically the Chevrolet Silverado HD and GMC Sierra HD, and serves as a larger replacement for previous 6.6-liter models to compete with heavy-duty diesel competitors. The ‘Mongoose’ is viewed as a direct competitive response to Ford’s ‘Scorpion’ engine. Technical specifications for the 8.3-liter Duramax V8 indicate it is expected to deliver between 555 and 563 horsepower and approximately 1,668 to 1,700 Nm of torque when paired with a ten-speed Allison automatic transmission. Engineering upgrades include a graphite cast iron block, forged ~~crankshafts and~~ crankshafts, connecting rods, steel pistons, and an improved two-stage water-to-air cooling system. These enhancements aim to increase towing capacities, with potential ranges ~~between 9,072~~ reaching up to 17,270 kg ~~and 17,237 kg. Additionally, GM is updating its 6.6-liter gasoline V8~~ (approximately 17.2 tonnes) with ~~improved intake manifolds and lubrication systems to increase its output to 417 horsepower.~~ a gooseneck hitch. In ~~September 2026, Chevrolet officially introduced~~ the United States, the 2027 Silverado HD lineup ~~featuring~~ will feature various trim levels, ranging from the 8.3-liter Duramax V8. The engine produces up to 563 horsepower and approximately 1,668 to 1,700 Nm of torque, managed by a ten-speed Allison automatic transmission. The vehicle offers a maximum towing capacity of up Work Truck (WT) starting at $38,600 to ~~17.2 tonnes with a gooseneck hitch and a payload capacity of 2.8 tonnes.~~ the premium High Country model priced at $71,700.

Versions

Only revisions since CLSTR began indexing content versions appear here. Select a version to see what changed compared to the one before it.