Deep dive: The 2027 Chevrolet Corvette’s all-new, next-generation V8
2026-03-26
By: Chris Perkins, Senior Writer and Editor, GM News
In its 72-year history, there have only been five generations of Chevrolet Small Block V8. Today, GM is proud to unveil the 6th, which debuts as the 6.7-liter “LS6” in the 2027 Corvette Stingray, Grand Sport, and Grand Sport X.
With 535 horsepower, it’s the most powerful base engine ever offered in a Corvette. Its 520 pound-feet of torque makes it the highest production torque of a naturally aspirated V8 ever. The LS6 is where the legacy of the Small Block meets the latest in advanced engineering. This engine is steeped in history and packing the best technology GM has to offer.
She’s Real Fine, My 409
The “LS6” name has been used throughout GM history, first appearing on a 454-cubic-inch version of the Small Block’s big sibling, the Big-Block, and again in a 5.7-liter Small-Block used in the C5 Corvette Z06 and the original Cadillac CTS-V. Bringing back this name pays tribute to GM V8 history, while also referencing the 6th generation of the Small-Block itself. The new LS6’s displacement in cubic inches is also the same as another muscle car legend: the 409. Giddy up, giddy up.
“We’re trying to recreate some of what worked in the muscle-car era,” says Mike Kociba, assistant chief engineer for the Small Block. “We wanted a wide, high torque band, and high power. It feels like we’re bringing a piece of Americana back.”
The specs are mouthwatering:
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535 horsepower @ 6,100 RPM
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520 pound-feet of torque @ 4,600 RPM
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6.7-liter displacement
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13.0:1 compression ratio
Having Your Cake and Eating It Too
Kociba and the rest of the Small Block team made an interesting discovery when they first mapped the specifications for the LS6 – they could make a bigger, more-powerful engine while also improving emissions and maintaining fuel economy.
“Historically, when you make large, high-power, high-torque engines, there’s a penalty,” Kociba explained. “But with advanced controls, our new fuel system, and a higher compression ratio, we’ve been able to improve emissions with a larger engine.”
That’s the benefit of having powerful digital tools to aid in engine design. You can trial more possibilities and, at times, effectively eliminate previous compromises.
“We were going to make it ‘only’ 6.6 liters, and then we started playing around and realized that by adding two millimeters to the stroke, we get more performance without compromising anything else,” Kociba said. “In the past, we might not have explored that.”
No Replacement for Displacement (Or Compression Ratio)
VIDEO TO EMBED: https://generalmotors.sharepoint.com/sites/GMGlobalCommunications-All/_layouts/15/stream.aspx?id=%2Fsites%2FGMGlobalCommunications%2DAll%2FShared%20Documents%2FChevrolet%20Brand%20Team%2FCorvette%2FYE%20%2D%20YEX%20%2B%20LS6%20Reveal%2FLS6%20Animation%2F260320%2DCorvette%2DLS6%2DSocial%2D1080p%5F30fps%5F10Mbs%5F%2Emp4&referrer=StreamWebApp%2EWeb&referrerScenario=AddressBarCopied%2Eview%2Ef940d4d2%2Da67e%2D4660%2D908d%2D5b0c334da4c1
Compared with the LS6’s predecessor, the 6.2-liter LT2, the bump to 6.7 liters comes via extending the stroke (the distance the piston travels up and down) from 92 mm to 100 mm. The bore (the diameter of the piston) remains at 103.25 mm, and just like 100 million-plus Small Blocks before it, the bore spacing (the distance between center of one piston to the next) of the Gen 6 is 4.4 inches.
Compression ratio – the ratio of the volume of the piston at the bottom of its travel compared to the top – is 13.0:1. Automotive enthusiasts will know this is a very high compression ratio, and in fact, it’s the highest ever for a Corvette.
The team wanted to beat the compression ratio of the legendary 427-cubic-inch L88 Big Block of 1967-1969, a V8 made specifically for racing. “That was 12.5:1 on leaded fuel,” Kociba says. “The only way we could pull off beating that today with unleaded fuel was with our advanced controls.”
Of course, the high compression ratio of the LS6 provides power, torque, and character, but it also improves thermal efficiency. This is a measure of how much of the potential energy in a fuel is being turned into mechanical energy, rather than waste heat. In simple terms, the LS6 extracts more mechanical energy from the same amount of fuel than its predecessors.
By Enthusiasts, For Enthusiasts
There’s a lot more in the LS6 to delight enthusiasts.
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Forged pistons and connecting rods to increase strength and save weight.
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Port- and direct-fuel injection for optimal fueling in all scenarios.
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A new oiling system to help ensure optimal lubrication in track-driving conditions.
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A larger 95-mm throttle body and high-velocity intake ports to keep the engine breathing well.
The Corvette team is particularly proud of a new center-exist exhaust available on the Stingray and Standard on the Grand Sport and Grand Sport X. “The sound and fury that comes out the tailpipes when you’re on the throttle is absolutely sublime,” Kociba says. “We say this all the time: the LS6 tantalizes all your senses.”
Made in Flint
The first-ever Chevy Small Block was made in Flint, Michigan on July 9, 1954, and production of the engine family there continued until 1999. Now, the Small Block returns to Flint, with the Michigan Flint Engine Operations facility responsible for assembling1 the LS6 for the Corvette.
Yet more proof that the LS6 is part of a long and great legacy.
1 Assembled in Flint, Michigan of US and globally sourced parts.
By: Chris Perkins, Senior Writer and Editor, GM News
A front view of the Next-Generation LS6 6.7L V8 which becomes the standard engine of the 2027 Stingray, Grand Sport and Grand Sport X.
In its 72-year history, there have only been five generations of Chevrolet Small Block V8. Today, GM is proud to unveil the 6th, which debuts as the 6.7-liter “LS6” in the 2027 Corvette Stingray, Grand Sport, and Grand Sport X.
With 535 horsepower, it’s the most powerful base engine ever offered in a Corvette. Its 520 pound-feet of torque makes it the highest production torque of a naturally aspirated V8 ever. The LS6 is where the legacy of the Small Block meets the latest in advanced engineering. This engine is steeped in history and packing the best technology GM has to offer.
She’s Real Fine, My 409
The “LS6” name has been used throughout GM history, first appearing on a 454-cubic-inch version of the Small Block’s big sibling, the Big-Block, and again in a 5.7-liter Small-Block used in the C5 Corvette Z06 and the original Cadillac CTS-V. Bringing back this name pays tribute to GM V8 history, while also referencing the 6th generation of the Small-Block itself. The new LS6’s displacement in cubic inches is also the same as another muscle car legend: the 409. Giddy up, giddy up.
“We’re trying to recreate some of what worked in the muscle-car era,” says Mike Kociba, assistant chief engineer for the Small Block. “We wanted a wide, high torque band, and high power. It feels like we’re bringing a piece of Americana back.”
The specs are mouthwatering:
- 535 horsepower @ 6,100 RPM
- 520 pound-feet of torque @ 4,600 RPM
- 6.7-liter displacement
- 13.0:1 compression ratio
Having Your Cake and Eating It Too
A rear view of the Next-Generation LS6 6.7L V8 which becomes the standard engine for Stingray, Grand Sport and Grand Sport X.
Kociba and the rest of the Small Block team made an interesting discovery when they first mapped the specifications for the LS6 – they could make a bigger, more-powerful engine while also improving emissions and maintaining fuel economy.
“Historically, when you make large, high-power, high-torque engines, there’s a penalty,” Kociba explained. “But with advanced controls, our new fuel system, and a higher compression ratio, we’ve been able to improve emissions with a larger engine.”
That’s the benefit of having powerful digital tools to aid in engine design. You can trial more possibilities and, at times, effectively eliminate previous compromises.
“We were going to make it ‘only’ 6.6 liters, and then we started playing around and realized that by adding two millimeters to the stroke, we get more performance without compromising anything else,” Kociba said. “In the past, we might not have explored that.”
No Replacement for Displacement (Or Compression Ratio)
Compared with the LS6’s predecessor, the 6.2-liter LT2, the bump to 6.7 liters comes via extending the stroke (the distance the piston travels up and down) from 92 mm to 100 mm. The bore (the diameter of the piston) remains at 103.25 mm, and just like 100 million-plus Small Blocks before it, the bore spacing (the distance between center of one piston to the next) of the Gen 6 is 4.4 inches.
Compression ratio – the ratio between the volume of the cylinder at the bottom of the piston’s travel and the top – is 13.0:1. Automotive enthusiasts will know this is a very high compression ratio, and in fact, it’s the highest ever for a Corvette.
The team wanted to beat the compression ratio of the legendary 427-cubic-inch L88 Big Block of 1967-1969, a V8 made specifically for racing. “That was 12.5:1 on leaded fuel,” Kociba says. “The only way we could pull off beating that today with unleaded fuel was with our advanced controls.”
Of course, the high compression ratio of the LS6 provides power, torque, and character, but it also improves thermal efficiency. This is a measure of how much of the potential energy in a fuel is being turned into mechanical energy, rather than waste heat. In simple terms, the LS6 extracts more mechanical energy from the same amount of fuel than its predecessors.
The 2027 Chevrolet Corvette Grand Sport Launch Edition in Arctic White and Grand Sport X in Pitch Gray Metallic positioned side by side, representing the next chapter of blended heritage-inspired design with a next-generation V8 engine that produces more torque than any other naturally aspirated V8 before it.
