Flint Assembly to Start 2027 Duramax Diesel Trucks
General Motors begins building 2027 Silverado HD and Sierra HD trucks with the 8.3-liter L6P Duramax diesel on November 16.
Updated on Nov. 9, 2026 in Trucks
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General Motors will begin production of 2027 Silverado HD and Sierra HD trucks equipped with the 8.3-liter L6P Duramax diesel at its Flint Assembly plant on November 16. The company is also ending production of 2026 model year turbo diesel trucks at the Michigan facility.
Why it matters
The switch from the 2026 to the 2027 diesel option marks a change in engine and pricing for buyers of heavy-duty pickups built in Flint. The new diesel option is priced higher than the model it replaces.
The L6P diesel is rated at 555 horsepower and 1,230 pound-feet of torque, and the 2027 Silverado HD carries a 38,000-pound maximum towing capacity and 6,170-pound maximum payload. The 2027 diesel option costs $11,400, up from $9,900 for the 2026 option.
The players
General Motors
General Motors is a Detroit-based automaker that builds Chevrolet and GMC trucks, including the Silverado HD and Sierra HD heavy-duty lines.
The details
Flint Assembly builds the 2500 and 3500 versions of the Silverado HD and Sierra HD, including duallies, while the 8.3-liter Duramax is produced at the DMAX facility in Ohio. The L6P uses a compacted graphite iron block and forged internal components and is paired with a 10-speed automatic transmission.
Timeline
November 16, 2026: Production of 2027 models with the L6P engine begins at Flint Assembly.
Latter part of 2026: Both 2027 models are set to launch.
Roadmap
The 2027 L6P continues the 8.3-liter Duramax heavy-duty diesel line that GM has built on for its Silverado HD and Sierra HD trucks. The change places the diesel option at a higher price point while the gasoline L8S 6.6-liter V8, assembled in Tonawanda, New York, remains a separate engine choice in the same lineup.
Buyers choosing the diesel option on a 2027 Silverado HD or Sierra HD will pay $11,400, which is $1,500 more than the 2026 diesel option. The higher cost applies to anyone configuring a heavy-duty truck for towing or hauling with the L6P.
The takeaway
Buyers weighing a heavy-duty diesel should compare the higher 2027 price against the towing and payload ratings before ordering. Matching the engine to actual hauling needs keeps the upgrade cost tied to real use.
What happens next
Both 2027 Silverado HD and Sierra HD models with the L6P diesel are set to launch in the latter part of 2026, following production starting November 16.
Further reading
For more on heavy-duty pickups, see the Trucks section.
Source note: This article includes information reported by Autoevolution.
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