Previous owner put this in. Has stayed for many plug changes. Any suggestions?

If it came out, you probably don't want to put it back in

Get a new plug and Timesert.

What does the hole in the head look like? See if time sert sells a one over spark plug insert. That looks suspect.

Here is one of in the holeClick to view attachment

Oof, yeah, don't even think about dealing with that. Trash it and redo! Start saving for new heads.

You have nothing to lose.

Thanks for all your help. I will get new serts and save for a new head for sure

HeadS. Then you're in there and 'might as well'. Hope the quick fix works for you.

You dont need a new head. They can be welded and redrilled. It is often done to go with the smaller 12mm plugs the reduce the possibikity of cracking.
. @914fun

Until you have the cash for new heads, time sert does make a over sized repair kit. Here is the link: https://www.timesert.com/html/bigsert_sparkplug.html

@914fun