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Most likely the "knock" is more of a "tap". Especially if it's a roller cam motor. GM stock hydraulic roller lifters are notorious for cold engine noise. Other than that, in earlier motors, GM had an issude with piston slap (www.gmpistonslap.com)

2006-07-24 19:19:07
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Q: What makes a 2002 Chevrolet HD knock at start up done this since new?
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