General Motors has detailed the powertrain details of the next-generation 2027 Chevy Silverado 1500 and GMC Sierra 1500. The new-generation full-size pickups will get two new sixth-generation Small Block V8 engines, while the updated 3.0-liter Duramax diesel will also continue in the lineup.
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The most interesting update is to the diesel version. With the available 34-gallon fuel tank and 2WD Duramax configuration, the 2027 Silverado/Sierra’s estimated highway driving range can reach 918 miles. This figure is based on the combination of a 27 mpg highway rating and a 34-gallon tank.
Also, GM has revealed the official output numbers of the new 5.7-liter L76 V8 and 6.6-liter L78 V8. The L78 produces 481 hp, while the L76 produces 402 hp.
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2027 Chevy Silverado 1500 Gets New V8 Engines
GM has introduced the sixth-generation Small Block V8 family for the 22027 Chevy Silverado 1500 and Sierra 1500.
The 5.7-liter L76 V8 produces 402 hp and 428 lb-ft of torque. It replaces the outgoing 5.3-liter V8.
The larger 6.6-liter L78 V8 produces 481 hp and 501 lb-ft of torque. According to GM, it is the most powerful naturally aspirated V8 in the light-duty full-size pickup segment.
| Engine | Power | Torque |
|---|---|---|
| 2.7L TurboMax | 350hp | 455lb-ft |
| 3.0L Duramax Diesel | 305hp | 495lb-ft |
| 5.7L L76 V8 | 402hp | 428lb-ft |
| 6.6L L78 V8 | 481hp | 501lb-ft |
All four engines are paired with a 10-speed automatic transmission, although engine availability varies by trim.
918-Mile Highway Range With Duramax Diesel
The 3.0-liter Duramax turbo-diesel inline-six will continue to be offered in the 2027 Chevy Silverado 1500 and Sierra 1500. The diesel engine develops 305 hp and 495 lb-ft of torque.
GM has also introduced an optional 34-gallon fuel tank. The 27 mpg highway rating of the 2WD Duramax configuration combined with the 34-gallon tank results in a calculated highway range of approximately 918 miles.
It’s important to note that 918 miles is not GM’s EPA-certified single-tank range figure; it’s the potential range derived from the 27 mpg highway rating × 34-gallon capacity.
The 34-gallon tank is available with the 5.7L V8, 6.6L V8, and 3.0L Duramax, while this option is not available with the 2.7L TurboMax.
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New 5.7L V8 Replaces the 5.3L
GM’s new 5.7L L76 V8 is equivalent to 350 cubic inches of displacement and replaces the previous 5.3L V8.
The engine produces 402 hp and 428 lb-ft of torque. GM has also used a new fuel-injection setup along with updates to the combustion, cooling, and control systems.
The new V8 architecture uses a combination of direct injection and port fuel injection technologies, which aim to optimize fuel delivery according to different operating conditions.
6.6L V8 Makes 481 HP
The top petrol V8 option is the 6.6-liter L78. It produces 481 hp and 501 lb-ft of torque.
This engine replaces the outgoing 6.2-liter V8 and provides segment-leading power figures in the naturally aspirated configuration, according to GM.
The 2027 Silverado comes standard with the High Country trim with a 5.7L V8, while the ZR2 comes standard with a 3.0L Duramax and a 6.6L V8 option.
2027 Chevy Silverado 1500 Price Starts at $41,395
Another major update is the 2027 Silverado 1500 pricing. Chevrolet has released current pricing details.
The entry-level Work Truck starts at $41,395 after including destination charge. The range-topping ZR2 starts at $79,995.
| 2027 Silverado 1500 Trim | Starting Price* |
|---|---|
| Work Truck | $41,395 |
| Custom | $46,395 |
| Silverado | $50,695 |
| Custom Trail Boss | $57,195 |
| Trail Boss | $63,995 |
| High Country | $74,495 |
| ZR2 | $79,995 |
Starting prices including destination charge, before options, taxes and other applicable fees.
According to Chevrolet, the first models of the 2027 Chevy Silverado 1500 will arrive at dealerships in late 2026. Higher trims are expected to arrive first, followed by more affordable versions.
New Silverado Gets More Technology
Along with the powertrain changes, the cabin and technology packages in the 2027 Silverado have also been upgraded.
Available/standard equipment depending on configuration includes 12.2-inch driver information display, 16.3-inch center touchscreen, LED lighting, adaptive cruise control, Safety Alert Seat, front and rear parking assistance and enhanced automatic emergency braking.
Super Cruise hands-free driving technology is also available in higher trims. The ZR2 features Super Cruise, 35-inch mud-terrain tires, upgraded suspension, underbody cameras, massaging seats, and a 34-gallon fuel tank.
2027 GMC Sierra 1500 Also Gets the Same Powertrain Family
The 2027 GMC Sierra 1500 will follow the same new-generation powertrain strategy.
GMC has confirmed that 5.7L and 6.6L Small Block V8s, enhanced TurboMax, and Duramax diesels will be available in the Sierra. All engines are paired with a 10-speed automatic transmission.
According to GMC, the first 2027 Sierra 1500 models are expected to arrive in dealerships before the end of 2026.
GM Is Keeping Diesel While Pickup Market Moves Toward Hybrids
The diesel strategy of the 2027 Chevy Silverado 1500 and Sierra is an interesting development in the US pickup market. According to Reuters, GM is continuing to pursue diesel efficiency, while Ford and Stellantis are focusing on hybrid solutions in the light-duty pickup segment.
GM’s updated Duramax produces 305 hp and 495 lb-ft of torque, and offers long-distance highway driving capability with an optional larger tank.
However, operating-cost calculations may differ if diesel fuel prices are higher than gasoline. Reuters also highlighted diesel fuel pricing as a relevant factor in ownership economics.
2027 Chevy Silverado 1500 vs. Current Model: What’s Changed?
The 2027 Chevy Silverado 1500 is receiving a major generation update for the 2027 model year. Main changes in:
- New 5.7L L76 V8
- New 6.6L L78 V8
- Updated 3.0L Duramax diesel
- Enhanced 2.7L TurboMax
- Optional 34-gallon fuel tank
- Up to 918-mile calculated highway range with 2WD Duramax
- New interior technology
- Updated driver-assistance features
- New exterior design
- 10-speed automatic across the engine lineup
- Higher starting prices on several trims
GM’s next-generation Silverado/Sierra program is to be rolled out in the US market in late 2026.
Auto India Daily Expert Verdict
The powertrain update of the 2027 Chevy Silverado 1500 and GMC Sierra 1500 is not limited to just styling changes. GM is making new V8 engines, updated Duramax diesel and larger fuel tanks a major part of next-generation trucks.
For US buyers, three numbers are particularly important: 402hp from the 5.7L V8, 481hp from the 6.6L V8 and a calculated 918-mile highway range for the 2WD Duramax with the 34-gallon tank. The actual choice will depend on trim, drivetrain, towing requirements, fuel costs and equipment.
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Raj Prajapati is a Senior Automotive Content Writer at AutoIndiaDaily. A B.Tech graduate in Computer Science and Engineering, he leverages over four years of experience covering Indian car and bike launches, EV tech, and market dynamics to break down complex automotive regulations into simple consumer guides. Specialising in Indian motor vehicle laws, IRDAI updates, and ownership costs, Raj translates technical auto policies into actionable advice for everyday drivers.