GM Teases Massive New 8.3-Liter 'Mongoose' Duramax V8AutoGuide.comAlbert GarciaMon, September 21, 2026 at 8:21 PM UTCAdd us on Googlegm teases massive new 8 3 liter mongoose duramax v8General Motors is continuing its full-scale truck overhaul, dropping a teaser for the engine set to power its upcoming heavy-duty pickup lineup: a massive 8.3-liter Duramax turbodiesel V8 nicknamed "Mongoose."While a mongoose might seem like a weird name for an engine, the name is a direct shot across the bow at cross-town rival Ford. In the natural world, the mongoose is a predator of the scorpion-which happens to be Ford's code name for the 6.7-liter Power Stroke turbodiesel V8 found in the F-Series Super Duty.GM leaned heavy into the rivalry in a new AI teaser video showing a mongoose battling a scorpion in the desert. The Scorpion is walking an oval pattern, while the mongoose has Chevy bowties in its eyes. Check it out:While GM withheld specific output, torque, and towing figures during the initial reveal, the massive 8.3-liter displacement strongly suggests the automaker is aiming for class-leading stats. Given the fierce competition among Detroit's Big Three heavy-duty trucks, the new Duramax V8 is expected to target top-tier honors in horsepower, stump-pulling torque, or maximum gooseneck towing capacity.AdvertisementAdvertisementMore official technical details and specifications for the next-generation Chevrolet Silverado HD and GMC Sierra HD are expected to drop in the coming weeks.Become an AutoGuide insider. Get the latest from the automotive world first by subscribing to our newsletterhere.
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