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Re: need more torque from 5.3
Tune, Thorley LT's, and gears would be your best mods. A small cam could help as well, something around 208-212.
2004 1500 Silverado Z-71 ECSB 5.3L 3" body lift, 305/55R20 Nitto Terragrapplers on 20x10 Helo's, and a few bolt-on's.
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