New 2027 Chevrolet Silverado HD Engines

The 2027 Chevrolet Silverado HD is bringing some major changes to the heavy-duty truck segment, and much of that story starts under the hood. For drivers who depend on their truck for towing, hauling, construction work, farming, recreation, or demanding jobs, the new Silverado HD offers two engine choices designed around capability.

For 2027, Chevrolet is introducing an all-new available 8.3L Duramax Turbo-Diesel V8 alongside an enhanced 6.6L gas V8. Both engines deliver more horsepower and torque than their predecessors and are paired with an Allison 10-speed automatic transmission. 

The All-New 8.3L DuraMax Turbo-Diesel V8

The biggest engine news for the 2027 Silverado HD is the available 8.3L Duramax Turbo-Diesel V8.

Chevrolet lists the new diesel at:

• 555 horsepower
• 1,230 lb.-ft. of torque
• Up to 38,000 pounds of maximum available towing
• Up to 6,170 pounds of maximum available payload

Those numbers make the 8.3L Duramax the centerpiece of the new Silverado HD powertrain lineup. 

That 1,230 lb.-ft. of torque is especially important for heavy-duty truck owners. Torque plays a major role when getting a heavy trailer moving, climbinggrades, and maintaining momentum while towing. The 2027 Silverado HD is designed to put that power to work when the job calls for it.

The new Duramax is also paired with an Allison 10-speed automatic transmission. Chevrolet has equipped the new HD with updated cooling systems and towing-focused engineering to help manage the demands that come with pulling heavy loads. 

The Enhanced 6.6L Gas V8

Diesel power is not the only option for 2027. Chevrolet is also enhancing the 6.6L gas V8 for Silverado HD buyers who want strong towing and hauling capability without stepping into a diesel powertrain.

The updated 6.6L gas V8 produces:

• 412 horsepower
• 472 lb.-ft. of torque
• Up to 19,000 pounds of maximum available towing
• Up to 6,990 pounds of maximum available payload

Like the Duramax, the gas V8 is paired with a 10-speed Allison automatic transmission.

The gas engine can make a lot of sense for drivers who need a heavy-duty truck for work, towing equipment, hauling materials, pulling campers, or handling weekend projects but do not necessarily need the maximum diesel towing capability.

Built for Towing

Engine output is only part of what makes a heavy-duty truck capable. The 2027 Silverado HD also receives updates to the systems responsible for controlling all that power.

Chevrolet is adding electric power steering and eBoost braking to the 2027 Silverado HD. The truck also gets towing-focused chassis, suspension, steering, and brake tuning. 

For diesel models, the combination of the Duramax engine, Allison 10-speed transmission, diesel exhaust braking, and grade-braking strategies is designed to help manage heavy trailers, particularly when traveling downhill.

The 2027 Silverado HD also offers available trailering technology, including camera systems and trailer monitoring features that can help drivers keep an eye on their truck and trailer.

38,000 Pounds of Available Towing Capability

If towing is your priority, the new Duramax gives the 2027 Silverado HD some serious numbers to work with.

When properly equipped, Chevrolet lists up to 38,000 pounds of maximum available towing for the 2027 Silverado HD. That opens the door to hauling large equipment trailers, fifth wheels, heavy campers, and other substantial loads. 

Of course, maximum towing capacity depends on the exact configuration, equipment, cab, drivetrain, trailer setup, and other factors. A truck’s maximum rating should always be checked against the specifications for the specific vehicle.

Which 2027 Silverado HD Engine Is Right for You?

The choice between the 6.6L gas V8 and the 8.3L Duramax Turbo-Diesel V8 comes down to how you plan to use your Silverado HD.

The 6.6L gas V8 may be a good fit for drivers who need heavy-duty capability for regular hauling and towing but do not require the maximum available towing rating.

The 8.3L Duramax Turbo-Diesel V8 is designed for drivers who regularly put their truck through serious towing duty and want the additional torque and maximum towing capability that comes with the new diesel.

Either way, the 2027 Silverado HD gives truck shoppers two powertrains built around the same goal: handling demanding work with confidence.

The New Silverado HD Is More Than an Engine Upgrade

The engine changes are a major part of the 2027 Silverado HD story, but they are only one piece of the truck’s larger update. Chevrolet is combining the new powertrains with revised steering, braking, towing technology, and other engineering changes to create a more capable HD truck. 

For drivers in Northern Indiana who use their trucks for heavy trailers, equipment, farms, construction projects, or long-distance towing, the 2027 Chevrolet Silverado HD is worth watching as it arrives later in 2026.

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