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  1. Engine & Performance
    I just finished swapping a low miles 4.8 from an 05 silverado 2wd into my 02 z71 that had a 5.3 that developed a severe knock around 290k miles. I have read that a tune will be required for the 4.8, who should i take it to for that and what does that usually cost? I live in Tucson and I'm...