Depends upon how deep you want to dive on this one. Startup clatter can be caused by your lifters, hydraulic chain tensioners, chain pad wear, cold start piston slap, bore scoring, or even stretched timing chains.
You need to isolate the source before even thinking about fixing it, as you can throw a lot of part and labor $ at it, and still have the issue if you guess wrong.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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