For those doing a head gasket job, or a 'stroker' m20 job, you can spend a lot of money having the machine shop take apart your head for cleaning/resufacing. Will teaches you whats required to do it yourself, and save a couple of dollars in doing so!
This How-To is the same for all m20 variants - the m20b267, m20b25, and super ETA are all the similar, but the process is the same.
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