GM Teases New Duramax Diesel 8.3-Liter V-8 Engine Called ‘Mongoose’, Unveils 2027 Silverado 1500 Pricing and Features
Published · Updated
Cited: Car and Driver, MotorTrend, Motor1.com
TL;DR
3-liter Duramax diesel V-8 called ‘Mongoose’ for its heavy-duty pickups, and reveals pricing and features for the 2027 Chevrolet Silverado 1500.
Why now
The announcement comes as the heavy-duty truck market heats up with Ford and Ram also updating their diesel engines, and Chevy refreshes its popular Silverado 1500 for the 2027 model year.
Agree / conflict
While GM and Ford continue to compete on diesel power outputs, some industry observers question the timing of a new large-displacement diesel amid growing electrification trends.
Takeaway
If you're in the market for a heavy-duty truck, the Mongoose engine promises class-leading power, while the 2027 Silverado 1500 offers significant upgrades across trims at higher prices.
General Motors has officially teased its new 8.3-liter Duramax diesel V-8 engine, dubbed 'Mongoose,' aimed squarely at Ford's 6.7-liter Power Stroke 'Scorpion' engine. The new powerplant will replace the current 6.6-liter Duramax in the 2027 Chevrolet Silverado HD and GMC Sierra HD models, expected to deliver over 500 horsepower and 1,200 lb-ft of torque. Meanwhile, Chevrolet has released full pricing and feature details for the 2027 Silverado 1500, which sees a price increase across the board but comes with a more powerful base engine, new 5.7-liter V-8 option, and a host of standard tech upgrades. The Silverado 1500 lineup now includes trims like the Z71, Custom Trail Boss, and the luxurious High Country, with prices ranging from $41,395 to $79,995.
FAQ
What is the 'Mongoose' engine?
The Mongoose is GM's new 8.3-liter Duramax turbo-diesel V-8 engine for heavy-duty trucks, named to rival Ford's 'Scorpion' Power Stroke.
When will the Mongoose engine be available?
It will launch in the 2027 Chevrolet Silverado HD and GMC Sierra HD, expected to debut before the end of 2026.
How does the Mongoose compare to Ford's Power Stroke?
GM hasn't released official figures, but the Mongoose is expected to exceed Ford's 500 hp and 1,200 lb-ft of torque.
What are the key updates for the 2027 Chevrolet Silverado 1500?
The Silverado 1500 gets a more powerful base TurboMax 2.7L I-4 (350 hp), a new 5.7L V-8 (402 hp), larger standard screens, and additional driver-assist features. Prices increased across trims.
Is the Silverado 1500 ZR2 still the top off-road trim?
Yes, the ZR2 starts at $79,995 and comes standard with the 3.0L turbodiesel or optional 6.6L V-8, Multimatic DSSV dampers, and 35-inch MT tires.
Sources
Canonical URL: /trend/2026/gm-teases-new-duramax-diesel-8-3-liter-v-8-engine-called-mongoose-unveils-2027-s
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