I just watched that mate, yupp that's definitely a loud ticking, & its not normal. I cant help but think you have missed something when you had the head off. If it was generator issue it wouldn't be running so rough when blipping throttle. Sound can resonate from the clutch pack etc, but no you have a internal problem there. Unless somebody else can suggest something then i would be stripping the entire engine again believing i had missed something. I asked about O2 bungs and things sometimes they can be slightly lose making escaping gas sound like a tick, but that's not it.
[SIGPIC][/SIGPIC]192MPH stock engined 2008