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I started seeing this crank damage on SC engines in the 80’s. When I was at Garretson’s, and saw this, Bruce Anderson, sent the folks he knew at Porsche this info, with no real results, except to suggest it was a crank treatment failure. Nitrating failure. He said that their Nitrating was like our Tuftriting. Maybe someone else can chime in. I only saw this on SC engines, and we thought it was probably a bad batch of cranks, lucky you.
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