3.0 cranks go thru a factory surface hardening process called tufftriding (sp?), they usually survive situations that would kill lesser cranks. from the pic yours looks good, but you need to have a machine shop polish it and mic it, to be sure. if you need to grind it undersize, it should be rehardened, and in that case the whole job should be done by a shop experienced in porsche crank repair.
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