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I've got the same year and engine Silverado.
A couple of things to check.
First, what type of oil are you using? 5W-30 or 10W-30 will make a difference. USe only 5W-30 and quality of oil makes a substantial difference as well.
If it is knocking now, then add a container of Rislone oil engine treatment. In 1 start the knock went away and never has returned ( mine definitely sounded like a lifter).
Change oil really regular... you don't want that investment to disappear by trying to sqeeze an extra 1000 K out of an oil change.
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