Yep thats how its suppost to look. If you look harder you'll notice only the exhaust cam has that gear (for the CPS as stated) and the intake cam does not have a gear.
As far as your #1-5 spark plugs looking good and #6 plug looking different, that sounds eerily similar to what mine looked like with a BHG. I can post a pic of my 1-5 plugs and my #6 plug. When I took off my head, all the valves in 1-5 looked the same but #6 looked different, just like the plugs were. That happens because its burning water which "cleans" the combustion chamber. But you don't have to take my word for it....
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