Ref: Loose cam sprocket
I found the loose cam sprocket late last night and after having time to think about it went back to investagate this morning. The person who had been looking into this engine noise before me had evidently left of the compensating washer off. This is the washer betyween the sprocket and the front tower on the left cam. No wonder the Woodruff key was hammered. The bolt and washer were not even in contact with the sprocket. All that was preventing the cam sprocket from taking a "spin" on the camshaft was the key. That certainly could not have last very long- I feel like I dodged a very big bullet.