GM’s Huge 8.3-Liter ‘Mongoose’ Diesel for Chevy and GMC’s HD Trucks Cranks Out 1230 LB-FT of Torque

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1. 1h ago

   GM Introduces 8.3L Mongoose Diesel for Heavy-Duty Trucks

   General Motors has announced an all-new heavy-duty diesel engine named the Mongoose. The massive 8.3-liter Duramax V8 turbo-diesel powers the upcoming 2027 Chevrolet Silverado HD and GMC Sierra HD trucks. According to published reports, the heavy-duty engine delivers an output of 555 horsepower and 1230 lb-ft of torque. General Motors stated the powertrain is designed to raise the bar for heavy-duty power, capability, and control.

   Why it matters

   The introduction of the 8.3-liter Mongoose diesel represents a major push into high-output powertrains for heavy-duty commercial and consumer trucks. General Motors is rolling out the engine alongside a broader strategy of four next-generation pickup engine types. This release pits the massive Duramax powerplant directly against heavy-duty alternatives from Ford Power Stroke and Ram Cummins.

   What is confirmed

   • General Motors announced an all-new Duramax 8.3-liter turbo-diesel V8 engine called the Mongoose for heavy-duty trucks.
   • The Mongoose diesel engine produces 555 horsepower and 1230 lb-ft of torque.
   • The 8.3L Mongoose diesel is slated for the 2027 Chevrolet Silverado HD and GMC Sierra HD trucks.

   Still unconfirmed

   • Pricing details for all trims of the 2027 Chevy Silverado remain subject to broader market breakdowns by automotive analysts.

   What to watch next

   • Full performance and towing capability testing benchmarks.
   • Detailed pricing and trim availability for the 2027 Chevrolet Silverado HD and GMC Sierra HD.
   Sources used for this update (9)

   1. Edmunds — How Much Is a 2027 Chevy Silverado? We Breakdown Every Trim's Price
   2. General Motors — Meet the Mongoose: GM teases all-new HD diesel engine
   3. Pickup Truck +SUV Talk — 8.3L Duramax vs. Ford Power Stroke vs. Ram Cummins
   4. General Motors — GM raises the bar for Heavy-Duty power, capability and control headlined by all-new Duramax 8.3L Turbo-Diesel V8 engine
   5. roadandtrack.com — GM’s Huge 8.3-Liter ‘Mongoose’ Diesel for Chevy and GMC’s HD Trucks Cranks Out 1230 LB-FT of Torque
   6. Car and Driver — The 2027 Chevy Silverado HD and GMC Sierra HD Debut a Gigantic 8.3L Diesel Engine Called Mongoose
   7. Motor1.com — GM’s New Mongoose 8.3-Liter Duramax Diesel Makes 555 HP, 1,230 LB-FT
   8. Bloomberg — GM Faces Down Fuel Prices With Big Trucks and Bigger Engines
   9. Detroit Free Press — GM’s next-generation pickup engines come in 4 types for a reason
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