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I have an '02 Silverado with 4.8 has 20,000 miles. I don't notice any noise at start up but hear a light ticking noise after it is warm. It sounds more like a lifter tapping than a piston knocking. Anyone know of anything like this? I have been to the dealer, they told me about the CSK, I told them that it's knocking after it's warmed up. They did the top engine cleaner. That didn't really do anything but make my truck stink for a few days. I did get the warranty on the engine so I guess I'll see what happens.
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