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I've built a couple dozen motors from our 911's to American V-8's to VW's to a variety of motorcycles, and every cam I have ever seen looked just like that. It's just burnishing. I would not hesitate to use it, if it's as good as the pics. See if there is any pitting, or any deep grooves that will catch a fingernail or something. It will also be obvious if the surface hardening is worn through - it will be a different color in that area, with kind of a "halo" around it. Absent any of that, you're probably good to go.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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