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I saw an article in hot rod, where they put 26.8lbs of boost on what they thought was a 5.3(ended up being a 4.8) with 155k miles and after 20 pulls on an engine dyno made a reliable 1200hp. possibly an idea?
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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