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Its is posible the valve its self is bent, which could be from abuse(no not ron, never) or from a tap that went unnoticed or "fixed itself" BUT a bent valve would cause it to not seat right and the way the LSx heads are its wouldn't cause any noise but it would cause lose of compression and a misfire code from having the cylinder fire but no power output from it.
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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