[rotorwrench]

On the helicopter engines I cut my teeth on, we replace the cams and follower assemblies 100% at O/H due to the high strung nature of that particular engine. The lighter duty engines for regular airplanes can have the cam and followers ground but it's usually a one time deal. The Lycoming engines didn't oil as well as the Continentals so they have a tendency to spall out anyway. Definitely don't take any chances on this stuff. They even put tricrestyl phosphate (TCP) in certain types of aircraft engine oil due to that. You can get away with a lot more on the flathead V8s as long as your easy on them.