GM's Troubled V8 Gets A Much-Needed Overhaul for Silverado and Sierra

Daily Car

31/03/2026

General Motors is set to introduce a significant upgrade for its popular Chevrolet Silverado and GMC Sierra trucks, addressing long-standing concerns with their current V8 engines. The upcoming 2027 models are expected to feature an all-new 6.7-liter V8, closely related to the recently unveiled LS6 engine powering the 2027 Corvette. This move signals a commitment to enhancing performance and reliability for GM's truck lineup.

Key Takeaways

A new 6.7-liter V8 engine is slated for the 2027 Chevrolet Silverado and GMC Sierra.
This engine is expected to replace the current, problematic 6.2-liter V8.
It will be closely related to the LS6 V8 introduced in the 2027 Corvette.
Initial estimates suggest power outputs around 460 hp and 510 lb-ft of torque for the trucks.

A New Heart for GM Trucks

The 2027 Chevrolet Corvette has debuted with an all-new 6.7-liter V8 engine, and it appears this potent powerplant won't be exclusive to the sports car for long. Reports indicate that the redesigned 2027 Chevrolet Silverado and GMC Sierra will also benefit from this new V8, which is poised to replace the company's less-than-stellar 6.2-liter V8. GM has hinted at this transition, referring to the LS6 as the beginning of the sixth generation of Small Block V8s, continuing a legacy spanning over seven decades.

Performance Expectations

In the Corvette, the new 6.7-liter V8 produces an impressive 535 horsepower and 520 lb-ft of torque. This represents a substantial increase over the outgoing Stingray's 6.2-liter V8. While the exact specifications for the Silverado and Sierra are yet to be confirmed, projections suggest a significant boost in performance. If the gains seen in the Corvette are indicative, the truck variant could see an increase of approximately 40 horsepower and 50 lb-ft of torque, potentially reaching around 460 horsepower and 510 lb-ft of torque. These figures would position the GM trucks competitively against rivals from Ram and Ford.

Competitive Landscape

With these estimated power figures, the new V8 would comfortably outperform Ram's 5.7-liter Hemi V8 and its twin-turbo 3.0-liter Hurricane inline-six. However, it might still fall short of the Ram 1500 RHO's output. Similarly, the enhanced V8 would likely surpass most of Ford's F-150 engine options, with only the F-150 Raptor's EcoBoost V6 and the F-150 R's supercharged V8 offering comparable or greater power.

Other Powertrain Options

While the new 6.7-liter V8 is a major development, the 2027 Silverado and Sierra are expected to offer a diverse range of other engine choices. These are anticipated to include a 2.7-liter four-cylinder turbo, a 3.0-liter turbodiesel inline-six, and a new 5.7-liter V8. More details about the full powertrain lineup are expected to be revealed later this year.

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