What can happen during cam bearing removal is who ever is removing the bearings may have the cam bearing tool to tight when driving out the old bearings. This scores the surface between the block and the bearing. Sort of compressing the bearing slightly, making the bearing tight on the cam. Remove the bearings and feel the surface to find any raised spots. Take a dremel tool and knock them down. They will be across the entire surface under the bearing. Hope this is your problem. Try it before you dump on the cam. It happens in some shops when breaking in a new core man.
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