In 2006, The HUMMER H1 was offered as a heavily modified Alpha model. The HUMMER H1 Alpha model received up to 520 pound-feet of torque from a 6.6-liter Duramax turbo diesel engine. The higher ...

Mark your calendars, because we're calling today a watershed moment for the advancement of diesel's acceptance in the U.S. General Motors has just announced a new 4.5L V8 Duramax turbo-diesel ...

Case-in-point, this massive Hummer H1 from Mil-Spec Automotive that was ... Under the hood is a tweaked 6.6-liter Duramax diesel good for 800 horsepower (597 kilowatts) and an obscene amount ...