Originally Posted by BMRLVR
The tight bearing clearances could have been a contributing factor but this engine had 20000+ miles without an issue so I doubt it was that.
True. But according to OP, only 1200 or so miles with the SC installed. If the clearances were marginal stock in this specific engine, could the extra charge from the SC push out the oil film in the bearings?
Further, didn't the Gintani engine run several seasons before they tore it down and observed the worn bearings?
Gearhead raised a good point: Were the jounals seized on the failed tie rod of the OP's engine?