What is the Horsepower of a 2004 Chevy duramax engine?

The horsepower of a 2004 Chevy Duramax engine varied depending on the trim level and configuration. There wasn't just one horsepower rating. Generally, you'll find that they ranged from approximately 250 to 300 horsepower. To know the exact horsepower for a specific 2004 Chevy Duramax, you'd need to check the vehicle's specifications, often found on a sticker inside the driver's side doorjamb or in the owner's manual.