http://Platinum-Chevrolet.com 707-525-1800 The standard power plant for the 2013 Chevrolet Silverado 2500HD is a 6.0-liter V8 backed by a six-speed automatic. This engine is rated at 360 horsepower and 380 pound-feet of torque. New for 2013, buyers can add a bi-fuel option, allowing the truck to run on either gasoline or compressed natural gas (CNG). When operating with CNG, power output is 301 hp and 333 lb-ft of torque.