I hear a rattle from in front of the passenger side at about 3000 rpm. Given the jack shaft system, I am thinking it is coming from the right side timing chain. Should I worry or this that a heavy duty chain that will make noise but not break?

if the timing chain breaks you will have major engine damage. expensive to fix. if rear chain engine removal required. good luck

This may help

4.0 sohc timing chain rattle - everything you need to know

__________________