Have been sorting out broken head studs and found some damage on a rocker. It must have happened a while back as you cn see a difference in the polished surface of the cam (it's not scored or damaged in any way - just a different colour). Looks like it was maybe a casting defect.
Should I replace it. If so, do I need to worry about how the replacement will bed in? Does it matter if I use a new or 2nd hand part?
Thanks for your help.
