One year ago I wiped a cam in a fresh rebuild. I swapped it out and even replaced the oil pump, as the inner and outer rotors had metal embedded in them. I was sure that I would be okay. 200 miles later I spun 2 rod bearings. I figure that the bearings were already going bad at the time I replaced the cam but took a little while to get bad enough to notice. Oddly it only wiped ONE lobe, but that was enough to send a stream of debris through the motor.