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How much horsepower does a 2003 Silverado 5.3 Liter engine have?

The horsepower for a 2003 Silverado 5.3L engine varied slightly depending on the specific trim level and options. However, it generally ranged from 285 to 295 horsepower. To know the exact horsepower for your specific truck, you'd need to check the sticker on the driver's side doorjamb or consult the owner's manual.