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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThe 8.3-liter “Mongoose” is General Motors’ new Duramax turbo-diesel V-8, reported under engine code L6P. GM has announced it for the 2027 Chevrolet Silverado HD and GMC Sierra HD pickup lines, including 2500 HD and 3500 HD models. Its published launch ratings are 555 horsepower and 1,230 lb-ft of torque.
What is the 8.3 Mongoose engine?
Mongoose is the nickname for GM’s 8.3-liter Duramax turbo-diesel V-8. Specialist coverage identifies its engine code as L6P; the nickname is a reference to Ford’s Power Stroke nickname, Scorpion. Car and Driver reported GM’s announcement on September 21, 2026, while Diesel Hub lists the L6P code and engine ratings.
GM’s announced peak output is 555 hp and 1,230 lb-ft. The reviewed specifications do not state the engine speeds at which it produces peak horsepower or torque. Diesel Hub also reports that the engine is paired with an Allison-branded 10-speed automatic.
Which vehicles will have the Mongoose engine?
GM has announced the engine for its 2027 heavy-duty pickup lines:
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- 2027 Chevrolet Silverado HD, including the 2500 HD and 3500 HD lines
- 2027 GMC Sierra HD, including the 2500 HD and 3500 HD lines
The announcement covers pickups. The available sources do not confirm the engine for chassis-cab trucks or other GM vehicles. The announcement is covered by Car and Driver and Power Progress.
What are the Mongoose engine’s reported specifications?
| Item | Reported information |
|---|---|
| Engine | 8.3-liter Duramax turbo-diesel V-8 |
| Engine code | L6P, as reported by Diesel Hub |
| Peak output | 555 hp and 1,230 lb-ft; peak-output RPM not stated by Diesel Hub |
| Transmission | Allison-branded 10-speed automatic, as reported by Diesel Hub |
| Reported design details | Compacted graphite iron block, forged crankshaft and connecting rods, steel pistons, variable-geometry turbocharger, and dual-stage air-to-water charge cooling, as reported by Road & Track |
Other detailed specifications—including bore, stroke, compression ratio, oil capacity, injection pressure, and peak-output RPM—are not stated in the reviewed coverage. Those figures should not be inferred from another Duramax generation.
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How much can a Mongoose-powered truck tow?
GM towing figures reported by Road & Track on September 24, 2026 are up to 20,000 pounds conventionally and up to 38,000 pounds with a gooseneck hitch on properly equipped trucks. These are not ratings for every Mongoose-equipped pickup. The available reports do not provide a complete model-, cab-, drivetrain-, or equipment-specific towing and payload table, so check the final rating for the exact truck configuration before relying on either maximum.
How does its output compare with Ford and Ram diesels?
The reported launch ratings are higher for the Mongoose than the cited high-output diesel ratings from Ford and Ram. These figures compare engine output, not the towing or payload capacity of particular truck configurations.
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| Engine | Reported horsepower | Reported torque |
|---|---|---|
| GM 8.3-liter Duramax Mongoose | 555 hp | 1,230 lb-ft |
| Ford 6.7-liter Power Stroke, high-output | 500 hp | 1,200 lb-ft |
| Ram 6.7-liter Cummins, high-output | 430 hp | 1,075 lb-ft |
The Ford and Ram figures are the cited high-output ratings; the available comparison does not establish a model year or configuration for each. Use the manufacturers’ ratings for the specific trucks being compared, since engine output alone does not determine tow or payload ratings.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What remains unconfirmed?
As of the cited September 2026 launch coverage, final pricing, order dates, dealer arrival timing, and configuration-specific towing and payload ratings are not established in the available reports. Nor do those sources confirm applications beyond the announced Silverado HD and Sierra HD pickups. The announcement describes intended availability, not a current inventory or order status.
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