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Are you thinking of aluminum rods, maybe? They are used in drag racing and get changed after 10 passes or so.
Proper assembly is very critical. Lot's ignorance on rod side clearance and crank endplay ot their. Just common practice for those that know what they are doing though.
Ti has similar material properties to steel, except for stiffness. It is less stiff than steel, so the rods have a bit larger cross-section. Looking at them you would think they would way a ton, until you pick one up. the service life of a Ti rod is about the same as steel, which is to say infinite. You don't design rods to work outside their elastic region, since that would mean the bores would distort, so fatigue is not an issue.
It is your 964 crank that I am concerned about. Never seen one used at high revs and boost, hence my suggestion for the extra insurance. hate to see anything happen to those expensive heads...!
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