Expansion plugs on back of head, lkq engine, marked, plugged

Hey guys I asked in tech and was told they mark the engine after inspecting. I have been buying a fair amount of parts but not sure if I should touch these plugs or not. (one is in the head the other is the bottom of the pass side block, towards rear) . Any idea if I need to replace these and if so what size these freeze plugs are since they are not standard? Thanks studs. Also I know it says void if removed but im just trying to understand it.

 

Keeping this here just incase. I used this thing called google and there was a tn post. I guess they arent in the freeze plugs but just plastic caps that melt so they know if the motor had over heated. Love you guys.

 

LKQ is reputable as far as salvage parts go. Do they still warranty their used engines?

 

Yeah I mean it wasnt bad, 1400 (i didnt return the core that wouldve saved me 200) 138k and got to see the 4runner it was in plus get a vincheck. Plus having the warranty that seems to cover rings/bearings. Still seems like a good deal compared to the "70k mile jdm" block I bought which was a complete mess and wasted 1100.

 

Not bad at all. Sucks that the other one was a dud, hopefully this one works out better for ya.

 

Thanks man, yeah hopefully it lasts me till 300k+ like the other one.