Magnum Cam Bearing Bores Scored

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thomasfouraker

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I removed the cam bearings out of a budget 5.9 build I am planning and noticed on the #1 cam bearing bore, there is scoring (gouges) that appear to have been there for some time. The gouges are dark and did not appear like "fresh clean metal". The cam bearings came out relatively easily and these gouges could have been there since installation from the factory. Is this anything I need to address or can I go ahead and drive the new bearings in? They do catch a fingernail and there are quite a few around the entire bore. Photos forthcoming.
 
Here are the photos

8031EADB-823C-46C9-B4D1-D8DC52256159.jpeg
 
What did the bearings you removed look like? If there was nothing but normal wear evident, I'd just replace them and sleep well at night.
 
Those marks in the block are not a big deal though I had to LMAO @ the sleeve retainer picture because jazak5 is right. As long as it doesn’t stick up high your good.
 
The bearings that came out were wrecked. Reason the block got pulled in the first place. I have read a few times and seen bearing failure on this vintage magnum motor before. Oddly enough, the bearing that looked the worst had the cleanest bore.
 
It almost looks like a machine presses these in, or they are cast in place

there is block casting metal that looks like it embedded in the backs of the bearings

8BA8B34F-206B-4D80-9C18-793817FDB455.jpeg


825AAD64-BC87-4C45-B2B7-6EBB17ECDE76.jpeg


B5A2F507-2F72-4719-ABCB-18FC6C3DB4F2.jpeg
 
What vintage Magnums have that issue?
 
The only time I've seen cam bearings like that was in my 392 International. They looked just like that and had lost enough babbit that the cam gear to crank gear centerline dimension decreased to the point it took teeth off the cam gear. Replaced them and all was good. One of my buds thought the failure was due to fatigue, I have no clue. Bottom line, I'd still just replace them and not worry.
 
They are pressed in, just like you are going to do. That wouldn’t concern me at all, if the bearing goes in tight. When they spin in the bore really bad things happen.
 
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