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Those are decent rods and great fasteners. Its got to be a rod bearing/spun failure as you have surmised.

I think the bearings weak link is the OE little tabs that secure them in. I think they should all be pinned in. As is when they see a little extra friction from lack of oil and they spin.

If they stade in place we would just see some bearing damage and not broken rods and blocks and everything else that can occur.



The tabs do not hold the bearing shells, it is only the crush that keeps them in place. The tabs are for locating only.

Lack of oil can cause a bearing to spin but more likely what happens is the big end of the rod gets eggshaped at RPM and the bearing bites the journal and then it's all over but the crying.

Sorry to hear about you problem, that's got to hurt.

"Follow me the wise man said, but he walked behind"


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