Magnum camshaft bearing mystery

737jetdr said

That's the case. Only 1 is bad. I just thought it was odd that both motors had the same bearing go bad. It looks terrible. I am changing the cam anyways but I was expecting to see damage to the cam but found nothing. I'm going to replace them for sure. This was more for my own curiosity .

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Could have been a bad run of bearings , high spots. Usually when I see an oiling issue the bearing changes color as well, darker color.
The cam bearing is ultimately fed from the intersection of the main saddle from the oil feed coming from the lifter galley.
So if you had a main bearing to look at from no. 4 and see how the hole lines up, if theres a feed issue