That is nuts,
This means the start of the cylinder threading has to be monitored as well as the electrode position on the plugs in reference to the start of the thread. Never mind the plug seat counterbore distance to the chamber ceiling**
I say another instance of Choimann over engineering leading to failure.
Good to know though. My buddy just bought one of those MB used I don't know if his has D.I.
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** will not affect index
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