Some Peterbilt Trucks Use Cummins Engines The PACCAR MX-13 produces as much as 510 horsepower and 1,850 pound-feet of torque and is found in 567, 579, and 589 Peterbilt truck models.

In the 1970s, when guys stormed grades like The Grapevine and Donner Pass in California, they wanted 400 horses to do it. Back then it took 855 cubic inches or 14 liters, as in Cummins’ NTC ...

The Paccar MX-11 engine will be available for Peterbilt’s flagship Model 579 and vocational Model 567 trucks beginning Nov. 13, the company has announced.