The 2027 Corvette Grand Sport family runs one engine in two forms. The rear-drive Grand Sport uses the LS6, a 6.7L naturally aspirated V8 making 535 horsepower and 520 lb-ft on its own. The Grand Sport X uses that same LS6 at the rear and adds a 186-hp electric drive motor on the front axle, for 721 combined horsepower and all-wheel drive. Both send power through an 8-speed dual-clutch automatic.

The structural fact buyers most often get wrong is which car is which. There is no turbocharger in either one, and the all-wheel drive belongs only to the X. This page covers the LS6 in detail, both powertrain configurations side by side, the transmission and drivetrain, and which one suits which driver. George Nunnally Chevrolet stocks both.

2027 Corvette Grand Sport Engine Lineup at a Glance

• LS6 6.7L naturally aspirated V8, rear-drive. 535 hp, 520 lb-ft. Offered on every Grand Sport 1LT, 2LT and 3LT, coupe or convertible.
• LS6 6.7L V8 plus front electric drive unit. 721 hp combined, from a 535-hp gas engine and a 186-hp electric motor. This is the Grand Sport X, offered on its own 1LT, 2LT and 3LT.

Both engines are the same casting and the same displacement. What separates the two cars is the front axle, and that single difference changes the drivetrain, the launch behavior and the weather the car is comfortable in.

Engine-by-Engine Breakdown

The LS6 6.7L V8 in the Grand Sport

The LS6 is the first of Chevrolet's sixth-generation small-block V8s, displacing 6.7 liters, or 409 cubic inches. It makes 535 horsepower and 520 lb-ft of torque, and Chevrolet describes that torque figure as the highest of any naturally aspirated production V8 ever built. It runs a 13.0:1 compression ratio, the highest of any Corvette V8, and it combines direct and port injection with Active Fuel Management. Chevrolet builds the LS6 at Flint Engine Operations in Michigan and assembles the car at Bowling Green, Kentucky.

What naturally aspirated means from the driver's seat is that there is nothing between your right foot and the crankshaft. Torque arrives the instant you ask and keeps arriving as the revs climb, with no boost building and no threshold to cross. On a road like AR-12 Scenic Highway 12, where the corners come in sequences and you are constantly settling and unsettling the car, that linearity is worth more than a bigger peak number would be. It is also the reason owners in Rogers and Springdale describe the car as easy rather than intimidating on roads they do not know. The available quad center exhaust is the acoustic half of the same argument.

The LS6 plus front electric drive in the Grand Sport X

The Grand Sport X keeps the LS6 driving the rear wheels, rated at 535 hp at 6,600 rpm and 520 lb-ft, and adds an electric drive unit to the front axle making 186 hp and 145 lb-ft. Combined output is 721 horsepower and the car is all-wheel drive. The front motor draws on a 1.9 kWh lithium-ion battery that tops itself up from the engine and from regenerative braking as you drive. No plug, no charge port, no electric range figure: it is not that kind of hybrid.

There is a Stealth mode that drives the car on the front motor alone up to about 50 mph, which is the one genuinely novel thing about living with it: a Corvette that leaves a neighborhood in silence. The X reaches 60 mph in 2.4 seconds and runs the quarter mile in 10.4 seconds at 131 mph, both with available equipment.

Transmissions and Drivetrains

One gearbox, two drivetrains. Every 2027 Corvette Grand Sport and Grand Sport X uses the 8-speed dual-clutch automatic mounted as a rear transaxle. No Corvette in this generation offers a manual transmission, on any variant, at any model level.

The Grand Sport is rear-wheel drive. The Grand Sport X is electrified all-wheel drive, with the gas engine driving the rear axle and the electric motor driving the front. Nothing is bundled to a gearbox choice here, because there is only one gearbox, so no feature on either car is gated behind a transmission option.

Every Grand Sport also carries Magnetic Selective Ride Control and Performance Traction Management as standard equipment, along with selectable drive modes, an enhanced Performance Data Recorder and a configurable Performance App that displays live performance data.

Side-by-Side Powertrain Matrix

Specification	Grand Sport	Grand Sport X
Engine	6.7L LS6 naturally aspirated V8, 409 cu in, both cars
Gas engine output	535 hp, 520 lb-ft	535 hp at 6,600 rpm, 520 lb-ft
Electric motor	Not offered	Front axle, 186 hp and 145 lb-ft
Total output	535 hp	721 hp combined
Battery	Not offered	1.9 kWh lithium-ion, self-charging, no plug
Transmission	8-speed dual-clutch automatic, rear transaxle, both cars
Drivetrain	Rear-wheel drive	Electrified all-wheel drive
0-60 mph	2.75 sec with available equipment	2.4 sec with available equipment
Quarter mile	10.95 sec at 124 mph	10.4 sec at 131 mph

Fuel Economy by Configuration

The EPA has certified no 2027 Corvette configuration, so no rating exists for either the Grand Sport or the Grand Sport X. Ratings publish at fueleconomy.gov and that is where to check as the model year runs.

Configuration	Fuel system	Tank
Grand Sport, rear-wheel drive	Gasoline, Active Fuel Management cylinder deactivation	18.5 gal
Grand Sport X, electrified AWD	Gasoline plus a self-charging front electric motor, no plug	18.5 gal

One thing worth knowing before you compare the X against a plug-in: it never needs charging and it has no electric-only range rating, because the battery exists to feed the front axle rather than to move the car for a commute.

Practically, that means neither car changes anything about how you refuel. An owner in Lowell, Bella Vista or Siloam Springs fills up the same way they always have, and an owner running down to Fayetteville and back does it on one tank with room to spare. The Grand Sport X's electric hardware is a traction and acceleration system, not an economy system, and it is worth being clear about that before the comparison starts.

Which Grand Sport Engine Is Right for You?

• You want the classic Corvette engine experience. The rear-drive Grand Sport, with the LS6 doing all of the work. Nothing between the pedal and the crank, and a naturally aspirated V8 that pulls to its ceiling. See Grand Sport inventory.
• You want the quickest car of the two. The Grand Sport X, at 721 combined horsepower and 2.4 seconds to 60 mph. See Grand Sport X inventory.
• You drive it in every season. The Grand Sport X, for the front electric axle. All-wheel drive changes what a cold, damp morning on US-62 feels like.
• You want the sound. The rear-drive Grand Sport with the available quad center exhaust. The X carries the same engine, but the rear-drive car is the one built around it.
• You are choosing between the two on paper. The full Grand Sport versus Grand Sport X comparison lays them out line by line.

Shop the Corvette Grand Sport at George Nunnally Chevrolet

George Nunnally Chevrolet is at 2700 SE Moberly Ln in Bentonville, which puts the good roads within a morning of the showroom: US-62 east toward the hills, AR-12 Scenic Highway 12 north across the water, and the long climbs of the Ozark Plateau south of Fayetteville. Buyers come to us from Rogers and Springdale for exactly that reason.

Corvette allocation is limited and engine-specific configurations move quickly. Call (479) 319-2494, schedule a drive, or get pre-approved first. If you are comparing against the older engine families, the 2026 Corvette Stingray runs the 6.2L LT2 and the 2026 Corvette ZR1 runs the twin-turbocharged 5.5L LT7, which are different engines entirely.

2027 Corvette Grand Sport Engine FAQs

What engine is in the 2027 Corvette Grand Sport?

The LS6, a 6.7L naturally aspirated V8 displacing 409 cubic inches. It makes 535 horsepower and 520 lb-ft of torque and is the first of Chevrolet's sixth-generation small-block engines.

Is the Corvette Grand Sport engine turbocharged?

No. The LS6 is naturally aspirated. The twin-turbocharged Corvette engine is the 5.5L LT7, used in the ZR1 and ZR1X, which is a different engine in a different car.

How much horsepower does the Grand Sport X have?

721 horsepower combined: 535 hp from the LS6 V8 driving the rear wheels, plus 186 hp from an electric drive motor on the front axle.

Does the Corvette Grand Sport come with a manual transmission?

No. Every Corvette in this generation uses the 8-speed dual-clutch automatic, mounted as a rear transaxle. No manual gearbox is offered on any variant.

How does the Grand Sport X hybrid system charge itself?

Through the engine and through regenerative braking, continuously, while you drive. That is why the car has no charge port and no electric-only range figure: the battery is sized to feed the front motor rather than to move the car on its own.

Which 2027 Corvette has all-wheel drive?

Only the Grand Sport X, and its front axle is turned by an electric motor rather than by a driveshaft from the gearbox. The rear-drive Grand Sport has no front drive hardware at all.

What fuel does the Grand Sport take?

Gasoline. The LS6 uses direct and port injection with Active Fuel Management, which can deactivate cylinders under light load. For the grade recommended for a specific build, check that vehicle's own documentation or call us.

What is the Grand Sport's compression ratio?

13.0:1, the highest compression ratio of any Corvette V8.

Explore the Corvette Grand Sport