GM Will Debut 8.3-Liter Duramax V8 in 2027

The record-setting engine for Silverado HD trucks will feature 555 horsepower and 1,230 lb-ft of torque.

Updated on Oct. 3, 2026 in Trucks

Isometric editorial illustration of a heavy-duty V8 engine block, rendered in matte geometric forms to represent automotive powertrain engineering. — General Motors will introduce an 8.3-liter Duramax V8 engine for its 2027 Silverado HD trucks, promising record-setting power and torque outputs. AI Illustration. Upload story photo >

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General Motors announced a new 8.3-liter Duramax V8 engine that will power its 2027 Silverado HD trucks. The engine is a clean-sheet design that will replace the existing 6.6-liter Duramax unit.

Why it matters

This new powertrain establishes a record for the largest-displacement production V8 engine ever built, surpassing the Cadillac 500 engine that has held the title since 1970. The update signals a significant performance shift for the heavy-duty truck segment.

The new engine produces 555 horsepower and 1,230 lb-ft of torque, managed by an Allison 10-speed automatic transmission. These capabilities allow for a maximum towing capacity of 38,000 pounds and a payload limit of 6,170 pounds.

The players

General Motors

General Motors is an American multinational automotive manufacturing company that designs, builds, and distributes vehicles and vehicle parts.

Chevrolet

Chevrolet is an American automobile division of the manufacturer General Motors that produces a wide range of vehicles, including the Silverado line.

Allison Transmission

Allison Transmission is a leading designer and manufacturer of vehicle propulsion solutions and the world's largest manufacturer of medium- and heavy-duty fully automatic transmissions.

The details

Constructed from compacted graphite iron, the engine utilizes a dual-stage air-to-water cooling system to handle its power output. Production for these engines is based in Brookville, Ohio.

1970: Cadillac 500 engine launched and set the previous displacement record.
2000: The 6.6-liter Duramax engine made its debut.
2027: The new 8.3-liter Duramax V8 will enter production for Silverado HD trucks.

Roadmap

General Motors is moving toward higher-performance mechanical power even as the broader industry pivots to electric propulsion. This launch positions the automaker to maintain dominance in the heavy-duty sector by outperforming legacy engine benchmarks.

Buyers looking for high-capacity towing will gain access to a platform capable of handling 38,000 pounds. However, those interested in the previous 6.6-liter Duramax units should note that the planned discontinuation may lead to rising prices for used inventory.

The takeaway

The introduction of the 8.3-liter engine highlights a focus on raw mechanical capacity for heavy-duty hauling needs. Drivers should prepare for potentially higher costs for older diesel models as production transitions to the new engine generation in 2027.