The wait is over. This morning, General Motors officially pulled the cover off the 2027 Corvette Grand Sport and the track-focused Grand Sport X. But the biggest news isn’t the aerodynamics or the badge, it’s the absolute monster sitting right behind the driver.

While the rest of the automotive industry is frantically downsizing, GM just doubled down on American muscle. The 2027 Grand Sport lineup is powered by an all-new, naturally aspirated 6.7-liter LS6 V8. The Grand Sport X adds even more power and all-wheel-drive. 

A close-up, high-detail photograph of the 2027 Chevrolet Corvette's 6.7-liter LS6 V8 engine. The engine features a metallic red cover with the Corvette crossed-flags emblem and black intake runners, surrounded by carbon fiber accents in the engine bay.
The heart of the 2027 Grand Sport: the 6.7L LS6 V8. While this setup is tuned for 535 horsepower in the Corvette, it shares the same core architecture that we expect to see, perhaps in a slightly different displacement, in the next-generation Silverado.

The Return of the LS6

GM is bringing back an iconic RPO code with some serious firepower. Here is what we know so far about the new 6.7L LS6:

  • Horsepower: 535 hp

  • Torque: 520 lb-ft

  •  Naturally Aspirated

This new engine architecture is a massive flex from GM engineering. It bridges the gap perfectly in the Corvette lineup, offering a high-revving, track-capable powerplant that delivers pure, unadulterated naturally aspirated power.

A front 3/4 angle view of a dark metallic 2027 Chevrolet Corvette Grand Sport X parked on an asphalt pad with a mountain range in the background. The car features aggressive aerodynamic bodywork, black wheels, and red brake calipers.
The 2027 Corvette Grand Sport X is the new high-tech king of the GS lineup. By pairing the 6.7L LS6 V8 with front-axle electric motors, it delivers a combined 721 horsepower and explosive all-wheel-drive performance.

The Grand Sport X: A 721-HP Successor to the E-Ray

If the standard Grand Sport is for the purists, the Grand Sport X is for those who want supercar-level stats. Effectively replacing the AWD E-Ray, the “X” pairing takes the new 6.7L LS6 and adds the front-axle electric motor and battery pack from the record-breaking ZR1X.

This hybrid setup delivers a combined 721 horsepower and near-instant torque, allowing for explosive all-wheel-drive launches. It even includes a “Stealth Mode” for quiet electric-only neighborhood exits up to 50 mph, alongside track-specific modes like “Qualifying” and “Push-to-Pass”.

But What Does This Mean for the Next-Gen Silverado?

If you read our site regularly, that “6.7-liter” displacement might have just made your ears perk up.

A few weeks ago, we published an exclusive leak from a GM dealer conference stating that the 2027 Silverado 1500 was getting two new engines: a tech-heavy 5.7L hybrid and a naturally aspirated 6.6L V8.

With today’s reveal of a 6.7L Corvette engine, we are officially looking at a 0.1-liter mystery.

A wide-angle interior photograph of the 2027 Chevrolet Corvette Grand Sport featuring a vibrant red leather cabin. The image shows the driver-focused cockpit, flat-bottom steering wheel, and advanced digital gauge cluster and infotainment screens.
The 2027 Corvette Grand Sport brings as much drama to the inside as it does to the engine bay. This wide view of the new red interior highlights the premium materials and tech that define the latest iteration of the C8.

Historically, GM loves to share flagship V8 architectures between the Corvette and their top-tier half-ton trucks. We saw it with the 6.2L LT1/L86 generation, and we see it right now with the 6.2L LT2/L87 generation. They take the same block footprint and tailor the tuning—one screams on the track, the other pulls a boat up a mountain.

So, does today’s news mean our Silverado source was slightly off, and the truck is actually getting this exact 6.7L displacement? Or is GM engineering a strictly truck-focused 6.6L variant of this new architecture specifically tuned for low-end towing grunt? Or are they finally splitting the Corvette and Silverado V8 bloodlines completely?

Honestly? Who knows.

6.6L or 6.7L? Tell us  your thoughts in our forum thread!

GM operates in mysterious ways, and until we see the official Silverado spec sheets, it’s anyone’s guess how these two massive V8s are going to coexist. But there is one major takeaway from today’s Corvette reveal that every truck fan should be celebrating: GM is still pouring serious R&D money into large-displacement, naturally aspirated V8s.

The V8 is far from dead, folks. We’ll just have to wait and see exactly how many liters make it under the hood of the next ZR2.

What’s your bet? Is the next-gen Silverado getting a 6.6L or a 6.7L?

Jump into the 2027+ Silverado & Sierra forums and let us know what you think!