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To clean up the head sealing surface you use a jig to hold the head in a lathe an turn the whole head. This jig and the "setup" for doing the twin plug mod is something a machine shop who does Porsche heads will have.
-Chris
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'80 911 Nogaro blue Phoenix!
'07 BMW 328i 245K miles!
http://members.rennlist.org/messinwith911s/
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