GM Teases New 8.3-Liter Duramax Diesel V8 For Its Heavy-Duty Trucks

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1. 2h ago

   GM Teases 8.3-Liter Duramax Diesel V8 Known As Mongoose

   General 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 company's diesel share in heavy-duty pickups.

   Why it matters

   General Motors is aggressively updating its truck portfolio, having released pricing and features for the 2027 Chevrolet Silverado 1500 alongside details for next-generation pickup engines. The heavy-duty market relies heavily on power metrics to attract commercial and towing customers, making the introduction of the Mongoose a strategic challenge against established competitors. Bringing engine design in-house signals a major shift in how General Motors manages its heavy-duty powertrain development and manufacturing pipeline.

   What is confirmed

   • General Motors teased an all-new HD diesel engine known as Mongoose.
   • The Mongoose engine is an 8.3-liter Duramax diesel V8.
   • The engine is fitted to 2027 model year HD trucks including the Chevrolet Silverado HD and GMC Sierra HD.
   • The Mongoose delivers 555 horsepower and 1,230 pound-feet of torque.

   What to watch next

   • Further official announcements regarding full vehicle availability and towing specifications for the 2027 heavy-duty truck lineup.
   • Production milestones and capacity updates from DMAX regarding the in-house engine build.
   Sources used for this update (12)

   1. Road & Track — Deep Dive: GM’s New 6.6-Liter Small Block V-8 Has the Power, Promises the Reliability
   2. MotorTrend — 2027 Chevrolet Silverado 1500 Pricing and Features Revealed: More Is More
   3. Motor1.com — GM Teases New 8.3-Liter Duramax Diesel V8 For Its Heavy-Duty Trucks
   4. Car and Driver — GM Targets Ford While Teasing Its New Duramax Diesel 8.3-Liter V-8 Engine Called ‘Mongoose’
   5. Detroit Free Press — Why no dipstick is needed to check oil in GM's next-gen pickup engines
   6. Road & Track — GM’s New HD Pickup Truck Engine Is an 8.3-Liter Behemoth Known As ‘Mongoose’
   7. General Motors — Meet the Mongoose: GM teases all-new HD diesel engine
   8. Car and Driver — 2027 GMC Sierra 1500 Starting Prices Spike with New Generation
   9. autos.yahoo.com — GM Unleashes 8.3L Duramax V8 with 555 HP and 1,230 LB-FT for 2027
   10. www.autoevolution.com — GM Unleashes Mongoose Duramax 8.3L Turbo Diesel V8, Promises Best-In-Segment Muscle
   11. www.slashgear.com — 555 HP: GM's New V8 Duramax Is A Beast, But Its Torque Is The Real Story
   12. www.automotiveworld.com — GM unveils all-new Duramax 8.3-litre diesel for HD pickups
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