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Uh oh. Unfortunately, there are chapters written on this topic.
That is a portion of a head stud. It's broken. The other half is still threaded in the crankcase. You have 24 of them, 4 per cylinder.
Go to Google.com, then type the search terms, "Pelican broken head stud", then continue reading. Short answer: Requires removal of top end, pistons/cylinder (minimally), and maybe more depending on age and condition of your engine.
The forum is here to help, but suggest absorbing some b.g. info first to get an idea of what's involved to repair.
Sherwood
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