Just last month, Ford announced that its all-new 6.7-liter Power Stroke V-8 diesel would pound out an incredible 390 horsepower and 735 pounds-feet of torque, giving the F-Series Super Duty best-in-class power ratings for heavy-duty pickups. Now, that short reign is over, according to General Motors.
GM announced that the updated 6.6-liter Duramax V-8 diesel for the 2011 Chevrolet Silverado and GMC Sierra HD pickups will make 397 hp (at 3,000 rpm) and a mind-blowing 765 pounds-feet of torque (at 1,600 rpm). That’s 105 more pounds-feet of twist than the 2010 Duramax V-8. We just warped our keyboard writing that.
The Duramax V-8, dubbed “LML" internally, is the latest generation of GM's HD diesel since it was introduced in 2001. Sixty percent of its parts are new, and Duramax chief engineer Gary Arvan said it will be 11 percent more fuel efficient than the previous LMM Duramax.
A different dyno-rated version of the 6.6-liter Duramax is offered in GM’s HD chassis cab and box-delete models. It’s based on the same new architecture and includes most of the same features as the pickup version, but it is engineered to meet federal certification standards for incomplete vehicles, including the incorporation of a different exhaust-gas recirculation system. It’s rated at 335 hp (at 3,100 rpm) and 685 pounds-feet of torque (at 1,600 rpm).
There are no changes in final power ratings for GM’s 6.0-liter V-8, which continues at 360 hp (at 5,400 rpm) and 380 pounds-feet of torque (at 4,200 rpm).