That piece that fell - it isn't a serious issue. Most likely, the worst case scenario is that it spends the next couple years partially clogging up your oil pump intake. - if it even makes it down there. There are so many places in the head it will get caught in before that.

Would I open up the valve cover to get it? yes.

Does it pose a threat to engine longevity ? 8/100


if you don't currently have the injection lines off - not worth it.

Be prepared to reseal the cover someday in the future and hope to get it then.

I would prob spend a couple hours trying to fish it out with wire and a some prayers

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