Powered by the Cummins Westport ISX12, the Peterbilt 567 offers Compressed Natural Gas (CNG) and Liquefied Natural Gas (LNG) to ensure the most power while eliminating emissions. The 567 is available with up to 400 horsepower and 1,450 Ib.-ft. of torque to keep up with tough jobs. See the gasoline/diesel powered Peterbilt 567