I called Oregon cams earlier this year to inquire about a regrind for my roller LA 408. Ken (I believe his name was?) advised against it because I told him I was looking for something pretty mild - around 230/236 @ .050 and .345" lobe lift and that was outside of what he'd recommend for a regrind. He said that would eliminate the surface hardening from the stock cam, even though the majority of the grinding would be on the base circle side of the lobe. He told me that the hardening on stock roller cams is pretty shallow and recommends VERY conservative spring pressures when they are used because of it.