There is no verified 0-60 mph time for the 2027 Chevy Silverado 1500 6.6 V8 yet. GM has not published an acceleration figure, and none of the first drives we read put the truck on a timing gear. What is known: the 6.6L makes 481 hp and 501 lb-ft, peak torque arrives at 4,000 rpm, and every outlet that drove it came away impressed. We will add an instrumented time once we can confirm one.
2027 Silverado 1500 6.6 V8 0-60 mph: what we know
When GM released the engine specs in September, Carscoops noted that the one thing nobody knew yet was how fast the V8 trucks would be, and that is still the case for the published record. The first-drive events in early November took place on public roads around Tucson, Arizona, and on off-road courses, with no acceleration runs reported.
The closest thing to a performance verdict so far is subjective. Carscoops' reviewer said the 6.6L felt every bit as quick as the last Ford Raptor he had driven. That is an impression from the driver's seat, not a stopwatch number, so treat it as such.
6.6L GM engine power at rpm
| 6.6L V8 (L78) | Outgoing 6.2L V8 (L87) | |
|---|---|---|
| Horsepower | 481 hp | 420 hp |
| Torque | 501 lb-ft | 460 lb-ft |
| Peak torque rpm | 4,000 rpm | — |
| Compression ratio | 12.5:1 | 11.5:1 |
Chevrolet calls the 6.6L the most powerful naturally aspirated V8 among half-ton pickups, based on GM's own estimated ratings. The 4,000 rpm torque peak comes from Motor1's spec sheet for the ZR2. We could not confirm the rpm at which the 481 hp peak arrives in any GM document or review we were able to open, so it is not in the table.
How the 6.6L compares with the rival half-ton V8s, according to The Drive:
| Engine | Horsepower | Torque |
|---|---|---|
| Chevrolet 6.6L V8 | 481 hp | 501 lb-ft |
| Ram 6.4L V8 (upcoming) | 470 hp | 455 lb-ft |
| Ford 5.0L V8 | 400 hp | 410 lb-ft |
2027 Silverado 1500 hp by engine
For anyone searching the full 2027 Silverado 1500 hp lineup, Chevrolet's figures are:
- 2.7L TurboMax I4: 350 hp, 455 lb-ft
- 3.0L Duramax diesel I6: 305 hp, 495 lb-ft
- 5.7L V8: 402 hp, 428 lb-ft
- 6.6L V8: 481 hp, 501 lb-ft
The 6.6L is limited to the top trims and four-wheel drive. Trim availability, towing and payload are in our 2027 Silverado 1500 V8 engines story, and the hardware behind both new V8s is explained in GM's new 5.7L and 6.6L V8s.
2027 Silverado 6.6 first-drive results
The Drive sampled the 5.7L, the 6.6L and the Duramax diesel. Its verdict on the bigger V8 was that there is no contest against the 5.7L if you can afford it, and it recommended the sport exhaust for anyone who wants to hear the engine. In a ZR2, the rear tires could break loose from a stop even with the stability systems switched on. The magazine scored the Silverado 8 out of 10.
Motor1 drove the 6.6L in both the High Country and the ZR2. In the High Country it called the engine "revelatory," with broad, usable torque and a strong exhaust note, though it said you have to rev the 6.6L out to get the most from it. In the ZR2 it praised how easy the throttle is to modulate off-road. Its main complaint: peak torque arrives about 900 rpm later than in the turbocharged Ford Raptor, so the V8 asks for more effort than forced-induction rivals.
Carscoops said the 6.6L makes the truck feel more responsive and described the cold-start exhaust as close to that of an unhinged performance truck.
Fuel economy is still unknown
EPA ratings had not been published when the reviews ran; The Drive lists fuel economy as "TBD" for every engine. Keep in mind that GM's owner's manual recommends premium fuel for the 6.6L, as our L76 vs. L78 explainer details.
If you are weighing a used truck instead, our 2023 Silverado 6.2L V8 specs cover the engine the 6.6L replaces, and the 2027 Silverado price list shows what the new trims cost.