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Titanium is not a good material if there is any chance of metal-to-metal contact.
Titanium galls like a mofo.
Add to the fact now you've got another different metal with differing (heat) expansion rate, and you've got one messy engine unless you calculate all the clearances correctly.
I bet it's almost necessary to run those under apex seal oil jets that Hurley Engineering was touting a few years back just to keep the apex seals from seizing in their slots...
-Ted
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