A few things that might help us with your unfortunate engine failure. 1. How do the main bearings look? Pics please. 2. Which rod bearing/bearings failed, cylinder number? 3. What connecting rods were you using? Were they tightened using stretch, angle or torque? Did the fasteners fail or were they loose? 4. If the connecting rods were new were they checked for housing bore size and then for actual oil clearance with a dial bore gauge before being installed? (especially Eagle). This info and some pictures of the failed bearings would be helpful. In general, a single failed bearing with the other 12 bearings in good condition points to a specific issue with a rod/bearing single issue, not a lubrication failure. A number of distressed bearings might indicate a lubrication failure.
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