My two penance on Camshaft wear,which ive seen my fair share of, with my involvement with ■■■■■■■■
1,Valve recession due to soft seats leading to valve clearance issues,basic engineering.
2,Bad top end sets.
3,Outer base profile with too sharp lift and drop off profile ultimately leading to seat and stem failures.
4,Bottom end failures due to oil pump being destroyed from Camshaft material mixing in the lube oil.