Well i've discovered the source of a clattering noise that has been slowly getting more pronounced and really bugging me. It brought to mind a story i remembered reading here a year and a half ago. Turns out to be a nearly identical scenario...
http://www.bonnevilleamerica.com/forums/...true#Post352382I've noticed this noise for about 5,000 miles or so. When i installed it originally,(with the 904 and cams) it had 15,000 miles on it. It now shows @ 55,000 miles. Apparently these heads can be worn out at 40,000 miles.
