camshaft won't last wtf !!!!!

[kamkam1]

Man, thanks for the replies, they are really appretiated. I think I found the problem, as some have sugguested, its the bronze valve guides are to tight. Since its the same valve and also after a closer look #4 exhaust valve also starting to go on both cams, I believe it's do to the bronze guides are tight ( on #4 and #7 exhaust) and since the exhaust vaves run hotter those 2 valves are trying sieze up. I won't really know until I remove the heads and check it out. About the oil, I used 20w-50w castrol and cam lube that cam with the cam. Thanks again for all relies, Later Kirk.