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I would say, How bad is it leaking??? A drip, a stream ????
It is not unusual for freeze plugs to leak a bit if they were installed DRY. A heat cycle or two may correct a small drip. A stream not likely. A lot of suppliers of reman or even new engines recommend their "sealant of choice" for cooling systems on install of the motor.
So a minor drip, MAYBE, a steady leak, not likely the long term fix I would be comfortable with. Hope this helped to some degree

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Put some stop leak in the coolant system and get it hot and all of the leaks will seal forever. It's a conditioner also for the coolant system too. No big deal on the freeze/core plugs, imo.

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