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Piston slap will go away as it warms up. My 93 LT1 had a little bit and my 00 SS has it when first started up in the cold. It's annoying, but goes away within a minute or 2. If you still hear that ticking noise, it could be ignition(spark jumping) or valvetrain related. Hopefully it's not a bearing.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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