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The surface rust that your photos show will cause the lobe to go soft. Cams are usually nitrided after a grind. That is a high temperature soak in a nitrogen enriched environment.(there is more to it) . Nitriding hardens the surface for more wear resistance. Surface rust goes thru the nitriding and will allow much faster wear on the lobes. Make sure they do the lifters also because a rough surface on a lifter can eat a camshaft very quickly. Good luck. Grant.
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