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Chevy and GMC’s New Heavy-Duty Trucks Debut a Huge 8.3L Diesel V-8

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Chevy and GMC’s New Heavy-Duty Trucks Debut a Huge 8.3L Diesel V-8

For 2027, the Silverado HD and Sierra HD also have higher tow ratings and finally switch to a more sophisticated steering setup.

When looking at the refreshed versions of the heavy-duty Chevrolet Silverado and GMC Sierra, we can’t help but think of the Fiat S76. Built in 1910, the S76 is better known as “The Beast of Turin.” It earned that moniker because of its 28.3-liter four-cylinder engine that sounds like a chained eldritch beast. These new GM workhorses, many of which will be powered by the company’s new diesel 8.3-liter V-8, could use a nickname as well. We haven’t heard the new engine—officially called Mongoose—roar yet, but maybe “Devil of Detroit” will work.

The new massive-displacement Duramax diesel will serve as an optional engine on both the Silverado HD and Sierra HD. As the new flagship engine, the Mongoose produces 555 horsepower and 1230 pound-feet of torque. It’ll be joined by an updated gas-slurping 6.6-liter V-8, which now generates 412 horses and 472 pound-feet. The gasser benefits from a new turbo-jet intake manifold that GM tuned specifically for HD performance. This powertrain also receives better cooling and lubrication under load, which is helpful since these HD pickups are often towing something. Both engine options are connected to an Allison 10-speed automatic transmission.

Of course, the new trucks don’t get power increases for nothing. Towing figures are up too. Naturally. The HD’s maximums have risen to 20,000 pounds with a conventional trailer hitch, while models equipped with a gooseneck setup can now lug up to 38,000 pounds.


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