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depends on which engine you have. 2004 was the transition year. look at the eighth digit in your vin # if its a "1" you have a LB7, if its a "2" you have a LLY. LB7 300hp 520ft tq LLY 310hp 605ft tq

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15y ago
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Q: How much horsepower does a 04 Duramax Diesel have?
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