New Gen VI Small Block V8 Engine on the 2027 Silverado
Originally published March 25, 2026 · Updated September 20, 2026

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The Short Version
- Two new sixth-generation small-block V8s replace the 5.3L and 6.2L on the 2027 Silverado 1500.
- The 5.7L makes 402 horsepower and 428 lb-ft. The 6.6L makes 481 horsepower and 501 lb-ft.
- Both use direct and port fuel injection and a 10-speed automatic.
- The 5.7L tows up to 13,700 pounds. The 6.6L tows up to 9,700 pounds.
The numbers for the engines in the redesigned 2027 Silverado 1500 are out, and the two new V8s are the headline. Here are the specs, what changed, and what each engine means for a driver around Bentonville, Rogers, Springdale and Fayetteville. For the whole truck, start with our 2027 Silverado 1500 research hub or the 2027 Silverado 1500 overview.
What is the Gen VI small-block V8?
The 2027 Silverado's V8s are sixth-generation small-block engines: the L76 5.7L and the L78 6.6L. They replace the 5.3L and 6.2L V8s. The 5.7L is 350 cubic inches with a stroke 6 mm longer than the engine it replaces, and the 6.6L is 400 cubic inches. Both use direct and port fuel injection, and a new lubrication system adds a continuously variable oil pump and an on-engine oil cooler. They are assembled at GM's Flint Engine Operations, Tonawanda Propulsion and St. Catharines Propulsion. The lineup offers the most powerful naturally aspirated V8 in its class, a GM-estimated claim.
2027 Silverado 1500 engine specs
The full spec sheet is on the 2027 Silverado 1500 specs page.
| Engine | Code | Horsepower | Torque | Transmission |
|---|---|---|---|---|
| 5.7L V8 | L76 | 402 hp @ 5,500 rpm | 428 lb-ft @ 4,300 rpm | 10-speed automatic |
| 6.6L V8 | L78 | 481 hp @ 5,800 rpm | 501 lb-ft @ 4,000 rpm | 10-speed automatic |
| 2.7L TurboMax (enhanced) | — | 350 hp @ 5,200 rpm | 455 lb-ft @ 3,000 rpm | 10-speed automatic |
| 3.0L Duramax turbo-diesel | — | 305 hp @ 3,750 rpm | 495 lb-ft @ 2,750 rpm | 10-speed automatic |
Which trims offer each V8?
The High Country comes with the 5.7L V8 and offers the 6.6L V8 as an option. The 6.6L is available on crew cab trucks only. If you are picking a trim around a specific engine, ask our team and we will confirm what Chevrolet has published for it. The 2027 Silverado 1500 trim guide covers all seven trims.
Towing with the new V8s
Each rating belongs to an engine and cab, so compare them that way.
- 5.7L V8: up to 13,700 pounds in a double cab 2WD with the Max Trailering Package.
- 6.6L V8: up to 9,700 pounds in a crew cab 4WD.
The 5.7L carries the higher tow rating, and the 6.6L carries the higher power rating. The 5.7L carries the higher tow rating, which suits camper and boat owners around Beaver Lake. The 6.6L carries the strongest acceleration. See every rating on our 2027 Silverado 1500 towing page.
Fuel tank and range
A 34-gallon fuel tank is available on double and crew cab trucks with the 5.7L and 6.6L V8s. With the Duramax diesel and the 34-gallon tank, GM says the highway driving range is over 900 miles. That is a GM figure, not an EPA-certified range, and EPA ratings for the 2027 Silverado 1500 come closer to launch.
Which 2027 Silverado engine fits your driving?
También lo explicamos en español.
- 5.7L V8: the highest tow rating in the lineup, and the standard engine on the High Country.
- 6.6L V8: the most horsepower and torque of the gas engines.
- 2.7L TurboMax: the highest payload rating, up to 2,340 pounds in a regular cab 2WD, and the standard engine on the Work Truck.
- 3.0L Duramax: 495 lb-ft of torque and the longest highway range, over 900 miles with the 34-gallon tank (a GM figure).
The heavy-duty Silverado 2500 and 3500 have their own engine lineup, which you can see on our Silverado HD page.
When can you get one?
The 2027 Silverado 1500 is expected on sale at the end of 2026 and will be available to order later this year. Read the release date and pricing breakdown and how to order and reserve one, or see the current Silverado 1500 inventory.
Common questions about the new V8s
More answers are in the 2027 Silverado 1500 FAQs.
How much horsepower does the 2027 Silverado 5.7L V8 make?
The new 5.7L V8 is rated at 402 horsepower and 428 lb-ft of torque.
How much horsepower does the 2027 Silverado 6.6L V8 make?
The new 6.6L V8 is rated at 481 horsepower and 501 lb-ft of torque.
Does the 5.7L V8 replace the 5.3L?
Yes. The 2027 Silverado 1500's 5.7L and 6.6L V8s replace the 5.3L and 6.2L V8s.
What does Gen VI mean?
They are sixth-generation small-block V8s: the L76 5.7L and the L78 6.6L.
What is the fuel economy of the 2027 Silverado V8s?
EPA fuel economy ratings for the 2027 Silverado 1500 come with launch. We will add them here when they are released.
Where are the new V8s built?
They are assembled at GM's Flint Engine Operations, Tonawanda Propulsion and St. Catharines Propulsion.
George Nunnally Chevrolet is at 2700 SE Moberly Ln in Bentonville. Call (479) 319-2494 or contact us, and get a number on your trade-in or pre-approval before the truck arrives. The service and maintenance page covers what the truck needs once you own it.