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Message: <blockquote data-quote="Iqlima" data-source="post: 86663" data-attributes="member: 174">Good way is apply pressure into each of chamber room. Water bubble at gap. Other way but not so good ,apply pressure on coolant system and you'll see water coming out between head and block if there is gap. Risk water going inside the chamber room !I'm not sure for BMW engine but what I normally see is water line and oil line always next to each other around chamber room,if there is a gap then they will mix up and absorb heat from chamber, as well oil will be in the coolant system.If  I were in budget position ,I'll took out head ,apply new gasket ,close back and pray hard this solve the issue.I did the same before on my RB20DET and I was in luck side.If you know how much torque need for to tighten the head bolt, then shouldn't be hard to this job. Of course time and right tool need . Hey ,tool last forever and can give to my son later on...By the way do you have extra car to drive around  ?Good Luck</blockquote>