Time to adjust the valves, most likely, they start making noise when
there is a loose one. Check the cam lobes and chain stretch at the
same time. When the cam wears out, you will get flat spots on the
tips of the lobes, and it starts making a "snick" sound as it goes
around. If this wear is starting, you need a new camshaft AND
followers, do NOT use the old ones (because they are worn out and
likely the cause of the cam wear).
A bad chain tensioner can cause some chain slap, too -- check the
main guide on the passenger side -- if it's deeply slotted by the
chain, replace it.
Peter
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