Those are split gears.
They are used on straight cut gears to eliminate gear backlash and noise.
When installing the cams, just try and make sure the alignment marks are close to the head surface edge.
When you tighten down the cam bearing caps, the marks should then perfectly align.
If the alignment marks are not not aligned, and the crankshaft was not rotated, then remove the cam bearing caps and reposition.
If everything is right, the alignment marks should then point to the flat edge of the head surface as in the service manual. Then torque the caps to spec.
It's difficult to check alignment on the front cylinder with the radiator in the way.
The rear cylinder check is a breeze with the fuel tank off.
Last edited by SubSailor; 03-13-2011 at 08:41 PM.