LB7 Cam bearings

[SilveradoTwins02]

Question for some of the more experienced Engine guys on here.
I am in process of rebuilding my LB7 it had 160K on it. check out the picture of the Cam bearings on this thing. Anyone have any idea why this happened? all the Babbit is off of them....

 

[delong_1]

i cant see the pic too well but cam bearings are just the copper

 

[SilveradoTwins02]

Oh so that is the part in Question.... the copper is showing on all bearings, i guess i am use to BBC and SBC bearings where they have a light grey Babbit material overlayed for the journals to ride against.
So what i am getting from your answer is that this is standard for these motors? i will check the ID with a bore gage and compare to the Cam journal.
thanks