Cracked head
Remove it and get it tested
The TTY head bolts will need replacing as will the multi layered steel head gasket
Use a razor blade to clean up the head and block surface, NEVER use sandpaper on the surfaces when using a multi layered steel head gasket
You often have to do a few hours of running once repaired (without antifreeze - just distilled water) to help the head gasket seal
Andrew
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