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One item that has recently been disclosed is the relationship of the various "holes" in the engine block and their relationship to each other causing unbalanced loads via the timing chain.
Your boring would have to be located in relation to the existing crank to take away the casting differences and assembly differences in the IMS bearing hole that has been claimed to affect the installation of even replacement IMS bearings and has been said to cause premature failure in replacement bearings.
Suggest looking in the rennlist 996 forum for a series of posts about claimed premature failure of an LN bearing and Jake Raby's posts re this issue possibly being a contributing factor in multiple failures in the same engine.
Given that there are several engines reported on the forums that have exhibited 2 or 3 very early failures and this is statistically improbable, there may be something to the suspicion..
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