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Valve noise on initial start up, is that normal?

(1998 Buick Century)
in East Wenatchee, WA on July 20, 2014
My 1998 Buiok Century has about 86,000 miles on it. On a cold start up, I have noticed that there seems to be what I think is valve rattle noise for about 4 or 5 minutes, then it subsides. Is this normal? Do you think adjustment of the valve lash is called for? Can a do it yourselfer even do that anymore? I'm getting about 20mpg combined, which I think is low. Thank you.
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