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The cam was probably dropped at some point and a stress fracture developed. The crack is not from an over torque event because you hold the cam on the front flats and apply the torque to the same part. Unless you had excessive spacers between the cam sprocket and the cam tower you could not have generated enough force to pull that piece off the cam.
Was this a welded and reground cam? If so I would ask for a replacement, maybe it was overheated in the welding process and/or not cooled correctly.
Mark
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1991 964 Polar Silver Metallic Turbo Coupe
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