I agree, but have never really had a problem with Chrysler locks. It is interesting that HP 360 and 340 engines had the multi groove, 4 groove, locks on the intakes as well.
That is true, but a SFT cam will beat the valves up fairly quickly because the lock will turn on the valve. You see this when you look at the valve and the material between the grooves is gone and they are razor sharp. That means the lock was beating the hell out of the valve.