Yeah and yours is a freak and ours isnt. You hit ridiculous times with the 5.3 I have now and even sweeter times with the LS1. Your truck must be on that pixie dust ****
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i share all of my knowlege and experiences. take it for what its worth. there was nothing special about my 5.3 back then, and nothing special about my LS1...just done right i guess. you have my old 5.3 and know its a strong motor...you just need to tweak it and play with it to get it right (like your doing right now)