top end noise

By 01 HD
January 22, 2007 in 2000-2014 Silverado HD & Sierra HD

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01 HD

Posted January 22, 2007

I have a 2001 2500HD with 8.1 and it has developed a noise that sounds like the valves. It does it a diffirent times when hot and cold but alwase when it is at low rpm's. my question is can you adjust the valves and If so how. Please commit on any other ideas as to what it could be. Thanks

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