GM Gives Us All The Details On Its New V8s: More Power, Better Towing

Live updates

1. 13d ago

   GM Deploys New V8 Engines for 2027 Silverado and Sierra

   General Motors is updating its 2027 Silverado and Sierra lineups with new V8 engines to drive growth amid inflation and EV costs. Heavy-duty trucks will offer a 555-horsepower Duramax diesel and a 412-horsepower gas V8, while light-duty models will use the L78 naturally aspirated 6.6-liter V8. All new V8s replace physical oil dipsticks with digital screen readouts. These launches occur while GM manages a federal investigation into L87 engine failures following a previous recall fix.

   Why it matters

   The company relies on truck sales to offset pressure from tariffs and electric vehicle expenses. The shift to digital oil monitoring marks a change in traditional engine maintenance. Ongoing federal scrutiny of previous engine models adds regulatory risk to these new releases.

   What is confirmed

   • The 2027 Chevrolet Silverado and GMC Sierra will feature new V8 engines.
   • Heavy-duty models will include a 555-horsepower Duramax diesel and a 412-horsepower gas V8.
   • Light-duty trucks will use the L78 naturally aspirated 6.6-liter V8.
   • GM is replacing physical oil dipsticks in both V8 engine sizes with digital screen readouts.
   • A federal investigation is examining L87 engine failures after a recall fix.

   Still unconfirmed

   • GM is relying on 2027 truck growth to offset tariffs, inflation, and EV costs.

   What to watch next

   • EPA fuel economy ratings for the L8T gas V8
   • Updates on the federal investigation into L87 engine failures
   Sources used for this update (2)

   1. autos.yahoo.com — GM’s Trucks Are Carrying the Company. The New 2027 Silverado ...
   2. thedailyautomotive.com — Chevy 6.6 Gas MPG: No EPA Rating, Real Test Numbers
   confidence 90%
2. 16d ago

   GM Updates 2027 V8 Engine Lineup with Digital Monitoring

   General Motors is introducing new V8 engines for its 2027 Silverado and Sierra pickups. Heavy-duty models will feature a 555-horsepower Duramax diesel and a 412-horsepower gas V8. Light-duty trucks will use the L78 naturally aspirated 6.6-liter V8. GM is removing physical oil dipsticks from both V8 engine sizes, replacing them with digital screen readouts. These updates arrive as the company manages a separate federal investigation into failures of the L87 engine following a previous recall fix.

   Why it matters

   The shift toward high-output V8s coincides with changes in U.S. government fuel economy targets and legislative policies. These regulatory adjustments may make larger engines more financially viable for automakers.

   What is confirmed

   • The 2027 heavy-duty Duramax diesel V8 generates 555 horsepower.
   • 2027 Silverado and Sierra V8 engines will use digital screen readouts instead of oil dipsticks.
   • The 2027 heavy-duty pickup lineup includes a 412-hp gas V8.

   Still unconfirmed

   • NHTSA opened engineering analysis EA26005 on August 20 following 499 complaints of L87 engine failures.
   • Regulatory shifts and legislative changes by the U.S. government are expected to boost V8 engine production.

   What to watch next

   • Results of the NHTSA engineering analysis EA26005 regarding L87 engine failures
   • Official release of towing capacities for the L78 light-duty V8
   Sources used for this update (4)

   1. www.fleetequipmentmag.com — Gas Vs. Diesel: GM’s New Heavy-Duty Engines
   2. truckdaily.com — NHTSA Opens Engineering Analysis on Nearly 1 Million GM ...
   3. stickshifting.com — GM’s 2027 V8 Trucks Are Back, But The Oil Dipstick Is ...
   4. mtlandexchange.com — Why V-8 Engines & Pickups Are Making a Massive Comeback (New ...
   confidence 90%
3. 23d ago

   GM Details New 2027 V8 And Diesel Engines

   General Motors is detailing its engine lineup for the 2027 truck models, featuring new small-block V8 options and a high-output diesel. The heavy-duty 2027 Silverado and Sierra models receive the 8.3-liter Duramax turbo-diesel V8, known as the L6P, which generates 555 horsepower and 1,230 lb-ft of torque paired with an Allison 10-speed transmission. Additionally, GM is launching two new naturally aspirated 6.6-liter V8 engines for the refreshed 2027 pickup lineup, including the L78 designed for light-duty applications.

   Why it matters

   Engine power and towing capacity remain primary competitive battlegrounds in the full-size and heavy-duty truck segments. The introduction of these powerplants updates GM's capabilities for light-duty and heavy-duty configurations across the Silverado and Sierra brands. These changes follow previous rollouts of sixth-generation small-block V8 engines and refreshed powertrain options.

   What is confirmed

   • The Duramax 8.3-liter L6P diesel engine produces 555 horsepower and 1,230 lb-ft of torque for 2027 Silverado HD and Sierra HD models.
   • GM is introducing two different naturally aspirated 6.6-liter V8 engines across its refreshed 2027 pickup truck lineup, with the L78 designed for light-duty models.

   Still unconfirmed

   • Pricing details for the 8.3L Duramax L6P engine and specific towing capacities for the 6.6L V8 variants remain unconfirmed by manufacturer specifications in the current source material.

   What to watch next

   • Official manufacturer release of pricing and complete towing metrics for the 6.6-liter V8 engines.
   • Detailed performance specifications regarding the Allison 10-speed transmission pairing with the new diesel engine.
   Sources used for this update (4)

   1. fastlaneonly.com — Duramax 8.3L: 7 Details on GM's 555-hp Diesel V8
   2. tunerdepot.com — 8.3L Duramax L6P Specs, HP & Price – Tuner Depot
   3. blog.drivehh.com — 2027 Chevy Silverado 1500 V8s: Two New Small Blocks, More ...
   4. newestcarsusa.com — GM Adds Two 6.6L V8 Engines for Its 2027 Trucks
   confidence 95%
4. 27d ago

   GM Reveals 2027 V8 Engine Specs for Silverado and Sierra Trucks

   General Motors is introducing a sixth-generation small-block V8 lineup for 2027 Silverado and Sierra 1500 models. The range includes 350 and 400 cubic inch engines producing 402 and 481 horsepower respectively. For heavy-duty models, GM is launching the Mongoose 8.3-liter Duramax turbo-diesel V8, which delivers 555 horsepower and over 1,200 lb-ft of torque. The 2027 GMC Sierra 1500 also gains a 5.7L V8 and a towing capacity of 13,500 lbs, alongside updates to the TurboMax and Duramax diesel options.

   Why it matters

   These high-displacement engines diverge from industry trends toward downsizing and electrification. The update targets heavy-duty performance and towing capabilities for the 2027 model year.

   What is confirmed

   • The 2027 Silverado and Sierra 1500 will feature sixth-generation small-block V8s in 350 and 400 cubic inch displacements.
   • The new small-block V8s produce 402 and 481 horsepower.
   • The 8.3-liter Duramax turbo-diesel V8 for HD trucks produces 555 horsepower and over 1,200 lb-ft of torque.

   Still unconfirmed

   • The 2027 GMC Sierra 1500 includes a 5.7L V8 engine and a 13,500-lb towing capacity.
   • The 2027 GMC Sierra 1500 features a redesigned interior and an upgraded TurboMax.

   What to watch next

   • Official GM confirmation of the 5.7L V8 specifications
   • Release of final torque figures for the 6.6-liter gasoline V8 options
   Sources used for this update (3)

   1. autoigloo.com — GM’s Two 6.6-Litre Truck V8s Deliver Very Different Power—and ...
   2. truckreportgeeks.com — 2027 GMC Sierra 1500: New V8 Engines, More Towing and a ...
   3. fastlaneonly.com — GM Small-Block V8 Gen 6: New 350 and 400 for 2027
   confidence 80%
5. 29d ago

   GM Details 2027 Truck Lineup With 8.3L Duramax V8

   General Motors has revealed details for its 2027 truck engine lineup, introducing an all-new 8.3-liter Duramax turbo-diesel V8 for the Chevrolet Silverado HD and GMC Sierra HD trucks. Known internally as Mongoose, the heavy-duty engine delivers 555 horsepower and currently produces over 1,200 lb-ft of torque. The automaker also updated the Silverado and Sierra 1500 trucks with two brand-new gas V8 engines and expanded its portfolio to include two distinct 6.6-liter gasoline V8 options. The heavy displacement units contrast with competitor strategies that focus on engine downsizing and changing electric vehicle demands.

   Why it matters

   The rollout of the heavy-duty engine underscores General Motors' continued commitment to internal combustion powerplants for commercial and personal haulers. The massive new powerplant breaks a 56-year-old record previously held by GM. While the diesel unit claims superior power over rivals Ford and Ram, details surrounding exact towing limits, durability, and ownership costs remain under evaluation.

   What is confirmed

   • General Motors is introducing an all-new 8.3-liter Duramax turbo-diesel V8 for the 2027 Chevrolet Silverado HD and GMC Sierra HD trucks.
   • The heavy-duty engine, known internally as Mongoose, produces 555 horsepower and over 1,200 lb-ft of torque.
   • The automaker has redesigned the Silverado and Sierra 1500 trucks to include two brand-new gas V8 engines.
   • GM now features two different 6.6-liter gasoline V8 engines within its full-size truck portfolio.

   Still unconfirmed

   • The new 8.3-liter Duramax engine holds additional performance potential beyond its current specifications.
   • Towing capabilities, durability metrics, and ownership costs will determine if the powerplant also claims the title of tow king against competitors Ford and Ram.

   What to watch next

   • Official release of complete towing capacity ratings for the 2027 Chevrolet Silverado HD and GMC Sierra HD equipped with the 8.3-liter Duramax V8.
   • Further engineering deep dives regarding DEF tank size and chassis integration.
   Sources used for this update (7)

   1. daxstreet.com — GM Unveils New 8.3-Liter Duramax Diesel for 2027 Heavy-Duty ...
   2. autos.yahoo.com — GM’s 2027 Truck Engine Lineup Has More V8s and a Monster New Diesel
   3. autos.yahoo.com — GM Brings Bigger Diesel Power With New 8.3L Duramax V8 for 2027 HDs
   4. tfltruck.com — Video: 2027 GMC Sierra HD 8.3L Duramax V8 & Chassis ...
   5. carbuzz.com — GM's Biggest Engine Is The 8.3 Mongoose, And It ... - CarBuzz
   6. gmauthority.com — GM Now Has Two 6.6L V8 Gas Engines, And They’re Very Different
   7. backfirenews.com — GM’s 555-HP Duramax 8.3L V8: Power King, But Not Tow King
   confidence 95%
6. 33d ago

   GM Says New 8.3L Duramax V8 Engine Has Room To Grow

   General Motors continues to detail the capabilities of its heavy-duty engine lineup, confirming that its massive 8.3-liter Duramax V8 powerplant holds additional performance potential. Known internally as Mongoose, the heavy-duty engine currently produces over 1,200 lb-ft of torque for the Chevrolet Silverado HD and GMC Sierra HD trucks. This powertrain rollout aligns with the automaker's continued focus on internal combustion options for commercial and personal haulers. While competitors explore engine downsizing and face shifting EV demand, the American manufacturer is leaning into heavy displacement units to secure market share across its core brands.

   Why it matters

   General Motors operates as the largest automaker in the United States by total sales and maintains global manufacturing operations across eight countries. Beyond its core vehicle divisions of Chevrolet, Buick, GMC, and Cadillac, the company oversees specialized entities including a defense vehicles division, OnStar, ACDelco, and GM Financial. The ongoing technical rollout of the heavy-duty diesel engine highlights the manufacturer's strategy to maintain a strong presence in the high-torque commercial and consumer truck sectors.

   What is confirmed

   • General Motors is headquartered in Detroit, Michigan, and owns Chevrolet, Buick, GMC, and Cadillac.
   • The company operates manufacturing plants in eight countries and previously held the title of the largest automaker in the world for 77 years.

   Still unconfirmed

   • The 8.3-liter Duramax Mongoose engine has additional juice left to squeeze beyond its current output.

   What to watch next

   • Official announcements from General Motors regarding higher output ratings for the 8.3-liter Duramax engine.
   • Dealer rollout and final specifications for the 2027 Chevrolet Silverado HD and GMC Sierra HD.
   Sources used for this update (4)

   1. www.gmfinancial.com — MyAccount Login - GM Financial
   2. en.wikipedia.org — General Motors - Wikipedia
   3. www.gmfinancial.com — Auto Loans, Leases & Vehicle Financing Solutions | GM Financial
   4. gmauthority.com — GM 8.3L V8 Duramax Mongoose Engine Has Room To Grow
   confidence 90%
7. 38d ago

   GM Details 2027 Heavy-Duty Trucks with 8.3L Duramax V8

   General Motors has released technical updates for the 2027 Chevrolet Silverado HD and GMC Sierra HD trucks, highlighting the heavy-duty engine specifications of its massive 8.3-liter Duramax turbodiesel V8. The newly detailed powerplant generates 555 horsepower and 1,230 lb-ft of torque, narrowly beating rival Ford and its 6.7-liter Power Stroke engine in torque output. This engine release forms part of a broader strategy by GM to reinforce internal combustion options as competitors lean into downsizing and EV adoption faces weak demand.

   Why it matters

   General Motors previously announced the next-generation small-block V8 and the 8.3-liter Duramax turbodiesel V8 nicknamed Mongoose to counter industry downsizing trends. The massive diesel engine specifically targets the heavy-duty segment dominated by Ford. These recent updates provide the concrete output figures for the upcoming 2027 vehicle rollout.

   What is confirmed

   • General Motors released updates for the 2027 Chevrolet Silverado HD and GMC Sierra HD.
   • The 8.3-liter Duramax V8 engine produces 555 horsepower and 1,230 lb-ft of torque.

   What to watch next

   • Full performance and towing testing of the 2027 Chevrolet Silverado HD and GMC Sierra HD
   • Official dealer pricing and availability dates for the 2027 heavy-duty truck lineup
   Sources used for this update (2)

   1. autos.yahoo.com — GM Unleashes 8.3L Duramax V8 with 555 HP and 1,230 LB-FT for 2027
   2. carbuzz.com — GM's New 8.3L Diesel Out-Torques Ford Powerstroke By The Tiniest Margins
   confidence 100%
8. 41d ago

   GM Unveils Massive New Engines for 2027 Full-Size and HD Pickups

   General Motors is rejecting auto industry downsizing trends by introducing a next-generation small-block V8 and an enormous 8.3-liter Duramax turbodiesel V8 nicknamed Mongoose. While competitors rely on smaller turbocharged engines, GM's new diesel engine explicitly targets Ford and its 6.7-liter Power Stroke engine. The upcoming 2027 Chevrolet Silverado HD and GMC Sierra HD will house this massive powerplant, signaling a continued commitment to large displacement engines for heavy-duty towing tasks. This rollout follows recent company moves to bolster internal combustion options amid lackluster electric vehicle sales.

   Why it matters

   Automotive manufacturers increasingly favor smaller turbocharged alternatives over traditional large displacement powerplants. General Motors is reversing this industry pattern with massive new combustion engine designs for its upcoming truck lineups. The heavy-duty segment remains fiercely competitive, prompting major domestic manufacturers to continuously scale up output and capability.

   What is confirmed

   • GM is introducing an 8.3-liter Duramax turbodiesel V8 nicknamed Mongoose for the 2027 Silverado HD and Sierra HD.
   • The Mongoose engine is designed to compete directly against Ford's Scorpion 6.7-liter Power Stroke.

   What to watch next

   • Official torque and horsepower specifications for the 8.3-liter Duramax Mongoose engine.
   • Detailed pricing and availability dates for the 2027 Chevrolet Silverado HD and GMC Sierra HD.
   Sources used for this update (3)

   1. autos.yahoo.com — GM’s New Small-Block V8s Pack A Much Harder Punch Than The Predecessors
   2. www.carscoops.com — GM’s New 8.3-Liter Duramax Is Called Mongoose Because It Wants To Eat Ford’s Scorpion
   3. www.thedrive.com — GM Is Actually Putting an 8.3L Duramax Diesel in Its HD Pickups to Devour Ford
   confidence 100%
9. 45d ago

   GM Reveals 481-HP V8 Engine for 2027 Pickups

   General Motors is introducing a next-generation 6.6-liter naturally aspirated V8 engine, designated as the L78, for the 2027 Chevrolet Silverado 1500 and GMC Sierra 1500. The engine produces 481 horsepower and is designed to improve power and towing capabilities. This move signals a renewed focus on traditional internal combustion engines for heavy-duty tasks as the company faces lackluster EV sales. The new design replaces traditional dipsticks with digital monitoring systems.

   Why it matters

   GM is positioning these engines to compete with Ford and Ram in a revived truck market conflict. While competitors are integrating hybrid options, GM is maintaining a strategy focused on V8 and diesel power. This shift reflects a strategic pivot to ensure competitiveness in the pickup segment during a period of slowing electric vehicle adoption.

   What is confirmed

   • The 2027 Chevrolet Silverado 1500 and GMC Sierra 1500 will feature a new 6.6-liter naturally aspirated V8 engine called the L78.
   • The new L78 engine produces 481 horsepower.
   • The next-generation V8 engines are slated for 2027 pickups.

   Still unconfirmed

   • GM is doubling down on diesel pickups while rivals utilize hybrids.

   What to watch next

   • Official towing capacity ratings for the L78 engine
   • Confirmation of hybrid powertrain additions to the 2027 lineup
   • Actual sales performance of 2027 V8 models compared to EV variants
   Sources used for this update (7)

   1. CNBC — GM touts new V-8 engines in revived ‘truck wars’ with Ford, Ram amid lackluster EV sales
   2. Detroit Free Press — What GM says its next-gen V-8 engines, slated for 2027 pickups, can do
   3. The Detroit News — General Motors 'very confident' in new V-8 pickup truck engine design
   4. Reuters — GM doubles down on diesel pickups as rivals tap hybrids
   5. Motor1.com — GM Gives Us All The Details On Its New V8s: More Power, Better Towing
   6. Motor1.com — Chevy's New V8 Engines Ditch The Dipstick And Go Digital
   7. autos.yahoo.com — GM’s New 481-HP 6.6-Liter V8 Powers the 2027 Silverado and Sierra
   confidence 90%