RB's are not non compliance heads ... they
basically the "saftey" mechanism is the fact that a top Dead Centre the valves do not extend far enough to hit the piston - which is what causes the damage
RB's WILL bend valves if you timing belt snaps
that (sticker as said above) is for writing on with the KMs the car has done before its changed
so if you change it at 90,000 the first time, you should change before 190,000 next time