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excessive blow by
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  1. Duramax First Generation: 2001-2004 (LB7)
    I am not a mechanic and I am probably way over my head! My son purchased a 2003 LB7 truck with 95,000 original miles. It runs rough at idle and has excessive blow by. The mechanic is recommending a used engine swap with a 176,000 mile LKQ motor instead of fixing this one. His reasoning is...
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