Almost all LS1's have piston slap at startup, especially in cooler weather. It should go away within a minute or 2 but if it lasts longer than that you might want to pass on or adjust your offer. My 2000 SS with 46K miles has the slap for 30-60 seconds on cold startups. It doesn't do it in the summer at all.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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