Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec Intersting .... CAMS

The cutting will heat up the metal locally, but any cutting shop should use oil or liquid cooling of some sort with a decent cutting blade. The properties of the metal will only be affected in a very local region.
Besides, these cams are assembled parts, the gears the lobes and journals will all be heat treated, but the tube may not and parts that fit on the tube are probably done at a different time. This is probably not a big issue.