The answer is: NO you do not need to add pins or keyways to the camshaft gears on this engine....
The VM engineers designed the cam gear sprockets fitmit to the cams on tapers with NO keyways or dowel pins for a valid reason.
You pin both cams to the intake/valve cover in the proper position using the two screw in alignment pins while leaving the two cam gear sprockets slightly loose which allows them to freely rotate on the camshafts tapers as you set the correct tension on the cam belt using the spring loaded tensioner pulley.
This allows infinite adjustment of the cam gear sprockets on the camshafts to get perfect timing relationships between the crankshaft and the two camshafts.
Once you have the rubber cam belt tensioned correctly, you then tighten the the two cam gear sprockets to the proper torque while holding the cam gear sprockets stationary with one of the special tools designed for this task.
Timing it this way gives you perfect timing!
If the camshaft gear sprockets were pinned (dowels) or had keyways, you would be forced to set the camshafts in relationship to the teeth on the rubber belt. This could cause the intake & exhaust cams to be OUT OF TIME with the crankshaft by several degrees and that would have a negative effect on engine performance and economy.
