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The NSX, G1,G2 and RLs are derived from the same engine family. On G1s, there have been cases of blown head gaskets but they appear to be quite rare. On the G2, the probability of getting it seems higher than a "maintenance issue". I've seen one instance of it on the RL board. I don't know about the history on the NSXes but they have a different head altogether.
All these engines are aluminum. So forget that one.
There's obviously a design weakness in the G2 engine somewhere that causes this to eventually happen.
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