I can’t believe General Motors is actually doing it. There was a rumor more than two years ago that GM would stuff an 8.3-liter Duramax diesel into the Chevy Silverado HD and GMC Sierra HD, but at the time, it seemed like little more than a pipe dream. Fast forward to 2026, and the manufacturer itself just confirmed it. The gargantuan power plant is nicknamed the Mongoose, and as you can tell by GM’s Monday morning announcement, it’s aimed squarely at trouncing Ford’s Power Stroke diesel. GM didn’t reveal any details aside from the displacement and the cylinder arrangement. It’ll be a turbodiesel V8, just like the diesel Chevy and…
GM Is Actually Putting an 8.3L Duramax Diesel in Its HD Pickups to Devour Ford
