Our Patriot 850 head is a two part design with a connecting water rail.
The water rail also includes a bleed screw unlike the factory head.
Because of the new OEM head design it will not be possible to make a "cheater" head for the 850 so in order to change domes you will need to go to a full billet design like ours.
The benefit of any of our heads is to be able to customize your head to your elevation, fuel type, riding type or turbo application.
The changable dome design also allows the customer to easily change between domes if you ride different elevations or if you go between racing and trail riding.
during check out you can choose all of the options or let us know if you have a specific cc volume you would like.