2001 Chevy 2500 Silverado Crew Cab Heavy Duty, , “Gone is the venerable 454 cubic inch (7.4 liter) big block in favor of a new 496 cubic inch (8.1 liter) V8 rated at 340 horsepower and 455 ft-lbs. of torque. Even with these impressive numbers, this new engine gets 4 percent better mileage than its predecessor and will run on compressed natural gas or liquid propane without special valves or other internal components.” Edmunds.com, , Call Brian OR Nik at the office 801-229-1454 and you can also see the rest of our inventory at cougarautosales.com