Quote:
Originally posted by leathermang
Lots of interesting speculation going on here... but I think it has to do with the hardening process.... there are malleable cam shafts, chilled cast iron camshafts, rocker arms with carbide facing and chrome and non chrome plated cap nuts for the valves.... most of which have to go with the proper combo...
This color could easily be from " flame hardening" or the likes...
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Any discolouration would have been removed during grinding. Were there any discolouration after grinding, it would be caused by not enough coolant or a dull grinding wheel. Had this happened the cam would have been somewhat anealed and worn out long ago.