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Not sure how a crank can ''delaminate''. Pretty sure it came from a solid billet. Is that pitting and if so, what would have caused it. I think the journals are put through a hardening process that effects the surface for less than a mm in depth. I recall that they did this back in the 4 cylinder days and cutting into that hardened surface was concerning as to the integrity of the repaired crank. I think that hardening process continued into the 6 cylinders. Marine Crankshafts could probably tell you. Curious. Bob
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