[Mart]

I'd recommend turning the cam. I know you can't with the gear as it is, but there must be a reason why the gear stripped it's teeth. There may be a sticking valve or some other reason that may have caused an extra load on the cam and stripped the gear teeth. If you can turn the cam by hand you can first of all see if it stops before making a complete turn, but also check that the turning force to open all valves is more or less equal.
Mart.