The 2027 GMC Sierra 1500 introduces an updated lineup of powertrains engineered to handle demanding jobs, daily commutes, and weekend towing. Drivers visiting Cable Dahmer Buick GMC of Kansas City can choose from four distinct engines, including two all-new sixth-generation Small Block V8 powertrains.
Knowing how each engine performs helps you select the right setup for your driving needs and towing requirements.
Reserve Today2027 Sierra 1500 Engines at a Glance
Every engine in the lineup is paired with a 10-speed automatic transmission. The table below shows peak output, where that output arrives in the rev range, and which trims offer each engine.
| Engine | Horsepower | Torque | Standard On | Available On |
|---|---|---|---|---|
| 2.7L TurboMax | 350 hp @ 5,200 rpm | 455 lb-ft @ 3,000 rpm | Pro, Elevation | None |
| 5.7L V8 | 402 hp @ 5,500 rpm | 428 lb-ft @ 4,300 rpm | AT4, Denali | Pro, Elevation |
| 6.6L V8 | 481 hp @ 5,800 rpm | 501 lb-ft @ 4,000 rpm | Denali Ultimate | Denali, AT4X |
| 3.0L Duramax Turbo-Diesel | 305 hp @ 3,750 rpm | 495 lb-ft @ 2,750 rpm | AT4X | Pro, Elevation, AT4, Denali, Denali Ultimate |
Notice where each engine makes its torque. The diesel and the TurboMax deliver peak torque low in the rev range, which is what you feel when pulling away from a stop with a loaded trailer. The V8s build power higher in the rev range and reward drivers who enjoy strong acceleration and highway passing.
2.7L TurboMax Turbocharged Engine
The 2.7L TurboMax turbocharged engine is standard on the Pro and Elevation trims, and it delivers impressive low-end torque and quick acceleration for everyday driving. For 2027, this enhanced four-cylinder engine generates 350 horsepower and 455 lb-ft of torque, which GMC says is the best standard torque in the class. It comes paired with a smooth-shifting 10-speed automatic transmission, making it a capable choice for light towing and daily city navigation around Kansas City.
The gains are significant. Compared to the previous TurboMax, output is up 40 horsepower and 25 lb-ft of torque. GMC achieved that with a new turbocharger, upgraded fuel injection, improved thermal management, and redesigned pistons. Because peak torque arrives at just 3,000 rpm, the TurboMax feels responsive in stop-and-go traffic and when merging onto the highway.
In a properly equipped Crew Cab, the TurboMax is rated to tow up to 9,200 pounds in 2WD form and 8,800 pounds with 4WD. That covers most utility trailers, small campers, and bass boats. It is paired with a 3.42 rear axle ratio, a slightly shorter gear than the V8s and diesel use, which helps it get heavier loads moving.
5.7L Sixth-Generation V8 Engine
Taking over the volume V8 position, the all-new 5.7L Small Block V8 provides a strong balance of traditional muscle and modern efficiency. This engine produces 402 horsepower and 428 lb-ft of torque, giving drivers confident highway passing power and the highest maximum towing capability in the Sierra 1500 lineup. It is an ideal option for truck owners who want reliable V8 performance for hauling cargo and pulling travel trailers.
The 5.7L is standard on AT4 and Denali and available on Pro and Elevation. When properly equipped with the Max Trailering Package, it is rated to tow up to 13,500 pounds in a Double Cab 4WD and up to 13,300 pounds in a Crew Cab 4WD. That makes it the engine to consider if you plan to pull a large travel trailer, a car hauler, or a horse trailer on a regular basis.
6.6L Sixth-Generation V8 Engine
For maximum gas-powered performance, the new 6.6L Small Block V8 stands as the most powerful naturally aspirated V8 engine in its class. It is standard on the Denali Ultimate and available on the Denali and AT4X. This flagship engine puts out 481 horsepower and 501 lb-ft of torque, making it GMC’s most powerful half-ton V8 ever and the largest-displacement V8 in its class.
The 6.6L is tuned for performance rather than maximum towing. It is rated to tow up to 9,400 pounds and carry up to 1,450 pounds of payload. Drivers who want effortless acceleration, strong passing power, and a premium driving experience will appreciate it most. If towing heavy loads is your top priority, the 5.7L V8 or the Duramax diesel offers higher ratings.
3.0L Duramax Turbo-Diesel Inline-Six Engine
The class-exclusive 3.0L Duramax Turbo-Diesel engine continues to offer outstanding efficiency and low-end pulling strength. Generating 305 horsepower and 495 lb-ft of torque, this engine reaches peak torque at just 2,750 rpm for effortless hauling. Long-distance drivers and frequent towing enthusiasts will appreciate its sustained towing power and exceptional highway range.
The Duramax is the most widely available engine in the lineup. It is standard on the AT4X and available on every other trim from Pro to Denali Ultimate. A properly equipped Crew Cab 4WD can tow up to 12,100 pounds. Paired with the new 34-gallon fuel tank, GMC estimates more than 900 miles of highway range, based on an estimated 27 mpg highway in 2WD form. EPA estimates were not yet available at launch, and actual range will vary.
Towing and Payload by Engine
Maximum ratings depend on cab, bed, drivetrain, and equipment. The figures below are for properly equipped Crew Cab models.
| Engine | Max Towing (2WD / 4WD) | Max Payload (2WD / 4WD) |
|---|---|---|
| 2.7L TurboMax | 9,200 / 8,800 lbs. | 2,010 / 2,020 lbs. |
| 5.7L V8 | 10,300 / 13,300 lbs. | 1,890 / 1,920 lbs. |
| 6.6L V8 | 4WD only: 9,400 lbs. | 4WD only: 1,450 lbs. |
| 3.0L Duramax | 10,100 / 12,100 lbs. | 1,850 / 1,790 lbs. |
The highest 4WD towing ratings require the Max Trailering Package. If you plan to tow near the upper end of these ranges, confirm the specific truck’s equipment before you buy.
Trailering Technology That Supports Every Engine
Engine output is only part of the towing story. The 2027 Sierra 1500 offers a camera system with up to 19 views, including transparent trailer views that make the trailer appear see-through on screen. Hitch View and a dedicated trailering app round out the trailering suite.
GMC also introduces an available Trailer Brake Gain Assistant, which the company calls an industry first, designed to help drivers set trailer brake gain. Super Cruise hands-free driver assistance works while towing on compatible roads. It is standard on AT4, AT4X, Denali, and Denali Ultimate and available on Elevation, though automatic lane changes are not available while trailering.
Choose Your 2027 Sierra 1500 at Cable Dahmer Buick GMC
Whether you need the efficiency of the TurboMax or the raw muscle of the new 6.6L V8, the 2027 GMC Sierra 1500 offers an engine option for every lifestyle. Contact our sales team or visit Cable Dahmer Buick GMC of Kansas City today to learn more about availability, explore trim options, and schedule your test drive.
1. **Class Competitiveness:** Based on latest competitive data available at time of release. Excludes other GM vehicles.
2. **Trailering Capacity:** Maximum trailering ratings are for comparison purposes only. Before towing, review the trailering section of your Sierra Owner’s Manual. Passenger weight, cargo, and aftermarket accessories reduce towing capacity.
3. **Super Cruise:** Always pay attention while driving and when using Super Cruise. Do not use a hand-held device. Requires active connected service plan or trial. Compatible roads and conditions apply.
4. **Estimated Range:** GM-estimated range based on a 34-gallon fuel tank and highway driving. EPA estimates not yet available at publication. Actual range will vary.
