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● TRACKER Updated 24d ago · 28 sources tracked

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

General Motors launched the 8.3-liter Mongoose Duramax V8 turbo-diesel for 2027 Chevrolet Silverado and GMC Sierra HD pickups. The engine delivers 555 horsepower and 1230 lb-ft of torque, though it produces 66.9 hp/L, which is lower than the 74.6 hp/L from Ford's 6.7L High-Output diesel. GM is charging an $11,400 premium for the L6P diesel engine over the base V8 gas option. The 2027 Silverado HD base price has increased over the 2026 model, and the 2027 GMC Sierra HD 2500HD Crew Cab 4WD trims cost $2,310 more than previous versions.

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  • ✓ The 8.3-liter Duramax V8 turbo-diesel produces 555 horsepower and 1230 lb-ft of torque.
  • ✓ The L6P diesel engine carries an $11,400 premium over the base V8 gas engine.
  • ✓ The 2027 Silverado HD base price is higher than the 2026 model.
  • ✓ GM offers an enhanced 412-hp gas V8 for 2027 HD pickups.
🛡️ Source Corroboration: 28 independent reporting domains (90% confidence) ⏱ Read time: ~2 min

What changed

Updated data includes the L6P engine designation, a comparison of power-per-liter against Ford, and the addition of an enhanced 412-hp gas V8.

Live updates

  1. GM Introduces 8.3-Liter Mongoose Diesel for 2027 HD Trucks

    General Motors launched the 8.3-liter Mongoose Duramax V8 turbo-diesel for 2027 Chevrolet Silverado and GMC Sierra HD pickups. The engine delivers 555 horsepower and 1230 lb-ft of torque, though it produces 66.9 hp/L, which is lower than the 74.6 hp/L from Ford's 6.7L High-Output diesel. GM is charging an $11,400 premium for the L6P diesel engine over the base V8 gas option. The 2027 Silverado HD base price has increased over the 2026 model, and the 2027 GMC Sierra HD 2500HD Crew Cab 4WD trims cost $2,310 more than previous versions.

    Why it matters

    GM is positioning the Mongoose diesel to compete with Ford in the heavy-duty pickup segment. The engine aims to increase towing capacities for the Silverado line. A 412-hp enhanced gas V8 also serves as an option for 2027 HD models.

    What is confirmed

    • The 8.3-liter Duramax V8 turbo-diesel produces 555 horsepower and 1230 lb-ft of torque.
    • The L6P diesel engine carries an $11,400 premium over the base V8 gas engine.
    • The 2027 Silverado HD base price is higher than the 2026 model.
    • GM offers an enhanced 412-hp gas V8 for 2027 HD pickups.

    Still unconfirmed

    • The Mongoose diesel V8 produces 414kW and 1668Nm.
    • The 2027 GMC Sierra HD 2500HD Crew Cab 4WD trims cost $2,310 more than the 2026 models.

    What to watch next

    • Official towing capacity ratings for the 8.3-liter engine
    • Customer delivery dates for 2027 HD models
    • Comparative fuel efficiency tests against Ford High-Output diesel
    Sources used for this update (4)
    1. www.autoevolution.com — 2027 Chevrolet Silverado HD Prices Revealed, New 8.3L Duramax ...
    2. carcody.com — GM Mongoose Duramax vs. Ford High-Output Power ... - Carcody
    3. www.fleetequipmentmag.com — Gas Vs. Diesel: GM’s New Heavy-Duty Engines
    4. redlandbaysidenews.com.au — Chevrolet unveils 8.3-litre diesel V8 to challenge Ford
    confidence 90%

  2. GM's 8.3L Duramax Diesel for 2027 HD Trucks Priced

    General Motors' new 8.3-liter Duramax V8 turbo-diesel engine produces 555 horsepower and 1230 lb-ft of torque. The engine is priced at an $11,400 premium over the base V8 gas engine. The 2027 GMC Sierra HD diesel truck costs $2,310 more than its 2026 counterpart on most 2500HD Crew Cab 4WD trims.

    Why it matters

    The new engine marks a shift from the 6.6-liter diesel architecture used for over two decades. The refreshed heavy-duty lineup includes brake-by-wire and electric power steering. This powertrain is part of GM's effort to revamp its HD truck offerings.

    What is confirmed

    • The 8.3-liter Duramax V8 turbo-diesel engine produces 555 horsepower and 1230 lb-ft of torque.
    • The 8.3-liter engine carries an $11,400 premium over the base naturally aspirated small-block V8 gas engine.
    • The 2027 GMC Sierra HD diesel truck costs $2,310 more than its 2026 counterpart on most 2500HD Crew Cab 4WD trims.
    • GM's new diesel engine is part of a refreshed heavy-duty lineup that includes brake-by-wire and electric power steering.

    What to watch next

    • 2027 Chevrolet Silverado HD pricing and availability
    • Comparative sales data for GM, Ford, and Ram HD trucks
    • Further details on the refreshed HD truck lineup
    Sources used for this update (4)
    1. tfltruck.com — News: We Have Official 2027 GMC Sierra HD Pricing: 8.3L ...
    2. carbuzz.com — 'Understressed On Purpose' - GM's 555-HP Mongoose Duramax Makes Less Power Per Liter Than Ford's Diesel
    3. www.autoevolution.com — GMC Prices 2027 Sierra HD and New Massive Diesel V8 Engine
    4. autos.yahoo.com — 2027 Sierra HD Diesel Jumps $2,310, 8.3L Costs $11,400
    confidence 90%

  3. GM's 8.3L Duramax Diesel for 2027 HD Trucks Hits 555 HP, 1230 LB-FT

    General Motors' new 8.3-liter Duramax V8 turbo-diesel engine produces 555 horsepower and 1230 lb-ft of torque for the 2027 Chevrolet Silverado HD and GMC Sierra HD pickups. This powertrain is part of a refreshed heavy-duty lineup that includes brake-by-wire and electric power steering. The engine marks a shift from the 6.6-liter diesel architecture used for over two decades.

    Why it matters

    The new engine is a significant upgrade for GM's heavy-duty trucks, offering more power and torque than its predecessor. This change comes as the company updates its HD lineup with modern features. The increased performance is expected to improve towing capacity and overall vehicle capability.

    What is confirmed

    • The 8.3L Duramax engine produces 555 horsepower and 1230 lb-ft of torque.
    • The engine is used in the 2027 Chevrolet Silverado HD and GMC Sierra HD pickups.
    • The new engine is part of a refreshed heavy-duty lineup that includes brake-by-wire and electric power steering.
    • GM's new diesel is the segment's top performer at 555 hp and 1,230 lb-ft of torque.
    • The 8.3L Duramax engine is a cheaper upgrade over the gas engine than Ford and Ram's diesels.

    What to watch next

    • 2027 Chevrolet Silverado HD and GMC Sierra HD pricing and release dates
    • Comparisons of the 8.3L Duramax engine's performance to competitors in real-world tests
    • Details on the towing capacity and capability of the new engine
    Sources used for this update (4)
    1. carbuzz.com — The 2027 Silverado HD's 8.3L Duramax Is A Beast ... - CarBuzz
    2. fastlaneonly.com — Duramax 8.3L: 7 Details on GM's 555-hp Diesel V8
    3. tunerdepot.com — 8.3L Duramax L6P Specs, HP & Price – Tuner Depot
    4. www.thedrive.com — GM's Mega 8.3L Duramax Diesel Is Actually Cheaper Than the ...
    confidence 100%

  4. GM's 8.3L Duramax Diesel Powers 2027 HD Trucks

    General Motors' new 8.3-liter Duramax V8 turbo-diesel engine produces 555 horsepower and 1230 lb-ft of torque for the 2027 Chevrolet Silverado HD and GMC Sierra HD pickups. This powertrain is part of a refreshed heavy-duty lineup that includes brake-by-wire and electric power steering. The engine marks a shift from the 6.6-liter diesel architecture used for over two decades.

    Why it matters

    The new engine is designed to increase heavy-duty power and control. The updated HD lineup features tow ratings reaching 38,000 pounds. This development is significant as it shows GM's effort to improve its heavy-duty truck offerings.

    What is confirmed

    • The 8.3-liter Duramax V8 turbo-diesel engine produces 555 horsepower and 1230 lb-ft of torque.
    • The engine is part of a refreshed heavy-duty lineup featuring brake-by-wire and electric power steering.
    • The updated HD lineup has tow ratings reaching 38,000 pounds.
    • GM's new engine marks a shift from the 6.6-liter diesel architecture used for over two decades.

    What to watch next

    • 2027 Chevrolet Silverado HD and GMC Sierra HD pickup truck sales
    • comparative towing and durability tests against Ford and Ram diesel trucks
    • ownership costs and long-term reliability data for the new 8.3-liter Duramax engine
    Sources used for this update (3)
    1. backfirenews.com — GM’s 555-HP Duramax 8.3L V8: Power King, But Not Tow King
    2. autos.yahoo.com — GM’s 2027 Truck Engine Lineup Has More V8s and a Monster New ...
    3. www.automotivepowertraintechnologyinternational.com — Clean-sheet diesel engine headlines GM’s 2027 HD pickup ...
    confidence 100%

  5. GM Launches 8.3-Liter Mongoose Diesel for 2027 Heavy-Duty Trucks

    General Motors introduced the Mongoose, an 8.3-liter Duramax V8 turbo-diesel engine for 2027 Chevrolet Silverado HD and GMC Sierra HD pickups. The engine produces 555 horsepower and 1230 lb-ft of torque. This powertrain accompanies a refreshed heavy-duty lineup featuring brake-by-wire, electric power steering, and tow ratings reaching 38,000 pounds. GM designed the engine to increase heavy-duty power and control, marking a shift from the 6.6-liter diesel architecture the company used for over two decades.

    Why it matters

    The Mongoose name targets Ford's Scorpion Power Stroke engine. This move departs from current industry electrification trends to compete in the high-torque diesel market. The engine also breaks a 56-year-old record previously held by GM.

    What is confirmed

    • The 8.3-liter Duramax V8 produces 555 horsepower and 1230 lb-ft of torque.
    • The Mongoose engine will be available in 2027 Chevrolet Silverado HD and GMC Sierra HD trucks.
    • GM added electric power steering and brake-by-wire to the 2027 heavy-duty pickup lineup.
    • The 2027 heavy-duty trucks feature tow ratings up to 38,000 pounds.

    Still unconfirmed

    • The 8.3L Duramax has additional performance potential remaining.
    • The engine's naming is specifically intended to compete with Ford's Scorpion.

    What to watch next

    • Release of official DEF tank specifications
    • Comparison of real-world towing performance against Ford competitors
    • Confirmation of final production dates for 2027 models
    Sources used for this update (8)
    1. daxstreet.com — GM Unveils New 8.3-Liter Duramax Diesel for 2027 Heavy-Duty ...
    2. gmauthority.com — GM 8.3L V8 Duramax Mongoose Engine Has Room To Grow
    3. autopostglobal.com — GM Just Unleashed an 8.3-Liter Diesel—Ford Better Watch Out
    4. cornfieldcars.com — 2027 Silverado HD and Sierra HD Get Big Diesel Power
    5. tfltruck.com — Video: 2027 GMC Sierra HD 8.3L Duramax V8 & Chassis ...
    6. carbuzz.com — GM's Biggest Engine Is The 8.3 Mongoose, And It ... - CarBuzz
    7. autos.yahoo.com — GM's 555-HP Duramax 8.3L V8: Power King, But Not Tow King
    8. www.motorbiscuit.com — GM Brings Bigger Diesel Power With New 8.3L Duramax V8 for ...
    confidence 95%

  6. GM Reveals 8.3L Mongoose Diesel for 2027 HD Trucks

    General Motors officially revealed the all-new 8.3-liter Duramax V8 turbo-diesel engine, named the Mongoose, for the upcoming 2027 Chevrolet Silverado HD and GMC Sierra HD trucks. Published reports and official announcements confirm the massive heavy-duty engine generates 555 horsepower and 1230 lb-ft of torque. General Motors stated the powertrain is built to raise the bar for heavy-duty power, capability, and control. In addition to the new diesel architecture, the refreshed 2027 heavy-duty lineup introduces electric power steering and brake-by-wire to GM HD pickup trucks for the first time, accompanied by higher tow ratings.

    Why it matters

    The announcement follows an earlier teaser video from General Motors that signaled the arrival of the new engine architecture. The updated heavy-duty trucks receive a more sophisticated steering setup alongside the massive power plant. These mechanical and technological additions aim to enhance capability and control for the refreshed truck lineup.

    What is confirmed

    • General Motors 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.
    • The engine delivers an output of 555 horsepower and 1230 lb-ft of torque.
    • Electric power steering and brake-by-wire join the GM HD pickup truck lineup for the first time.
    • The 2027 Silverado HD and Sierra HD feature higher tow ratings and a more sophisticated steering setup.

    What to watch next

    • Full performance testing and official payload ratings for the 2027 Chevrolet Silverado HD and GMC Sierra HD
    • Release of pricing and specific trim-level availability for the Mongoose diesel engine
    Sources used for this update (5)
    1. autos.yahoo.com — GM’s Huge 8.3-Liter ‘Mongoose’ Diesel for Chevy and GMC’s HD ...
    2. www.caranddriver.com — Chevy and GMC’s New Heavy-Duty Trucks Get a Huge 8.3-Liter ...
    3. www.duramaxnews.com — GM Officially Reveals the 8.3L Duramax: 555 HP, 1,230 LB-FT ...
    4. gmauthority.com — GM 8.3L V8 Duramax Diesel Output Revealed - GM Authority
    5. www.enginelabs.com — GM Unleashes the 8.3-liter Mongoose Duramax - EngineLabs
    confidence 100%

  7. 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
    confidence 100%
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