Yep, cam bearing wear is not the problem, cam wear is...
Unless you have the new rollers, the older style mushroom cam followers really chew up the cam lobes on Lyc's. The mushroom followers are cast iron and rust very quickly. Thus each startup wears the cam lobe and inactivity generates more rust and wear.
This is the reason for the recommended Lyc lube which is added at oil change time or included in the oil (Aeroshell Plus).
My two past 360's had excessively worn cams at overhaul time which did not pass inspection (by a wide margin).
Thats one of the reasons a new IO-390X sits in my shop awaiting installation on my RV8QB...IF I can get off this computer and back to work on it.
Deene Ogden
RV8QB, IO-390X, BA Hartzell, Clark Fastback, James cowl
EAA Tech Counselor, EAA Flight Advisor
CFII, MEI, CFIG