Spark plug thread inserts., Should I be concerned? Options

[Erben914]

I have my engine out for a bear tub restoration. I am reassembling everything and almost ready to put the engine back in.
As I was cleaning things up replacing the tube seals and getting ready to adjust the valves I found these threaded sleeves in my spark plug holes.
Looks like a PO was a DA?
Did they strip all of the spark plug threads and use threaded inserts?
I probably wouldn't have even noticed but they are loose and partially back out when I took out the plugs.
They are at different depths now but do they bottom out when the plug is tight?
I can't tell because the base of the plug covers the sleeve when the plugs are in place.
I really don't want to take the heads off. I had no issues prior.
If it ain't broke don't fix it?
Or am I risking a bigger problem?

[Mblizzard]

Clean the area around the spark plugs and look for cracks. If the inserts are tight and seem to be done well then I think it is a judgement call on what to do about them. As the Cap'n said, if they are lose then thy are toast. If you are going to do a valve job I would fix them. But because you were putting the engine in they must be in pretty good shape. If there are no cracks and all are tight then it seems like you could just clean them up and go back together.

Others may disagree here but unless you are doing the heads I would leave the rings alone. This is based on the assumption that the engine was running well and had good compression when removed. At this point, all of the parts are playing well together. Changing the rings could change the compression and cause changes.

Of course for me, it would be hard to take it that far down and not fix everything I could.