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Was this a new shortblock or a reman engine?
If the crank was turned undersize with the wrong radius it can cause a weak spot.


That would be my take. Curious to see what undersize the rod bearings are stamped with. Mitsubishi had a TSB about not cutting the cast crank undersized. Pretty sure they use a rolled fillet on the crank that cant be duplicated on a rebuild.

Can you get a close up of the fracture?


Kevin

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...