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Nov 10, 2010 01:36 EST Ouissam Youssef INC Powertrains and Performance The standard engine in the Chevy Silverado 2500 is a 6.0-liter gasoline-fueled V8 making 353 horsepower and 373 pound-feet of torque. A six-speed automatic transmission is standard. Optional is a 6.6-liter turbodiesel Duramax V8 that boasts 365 hp and 660 lb-ft of torque.