You probably have the 3rd & last design IMSB which should be the most reliable OEM bearing.
No need to worry about it as long as you change the oil as you should. Read LN Engineering recommendations for oil to use.
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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