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I had the 5.3 in my 06 Silverado. Probably not that nice looking on paper but for what it was it would get up and go pretty good especially in a full size truck with a 6in lift and 37s
I have a 99 and for that year only it is 275/325.....00 went up to 285/335 The aluminum 5.3 L33 came out in 05 IIRC and depending on year made 305-315...