the multi groove locks allow the valve to rotate freely i read this in an article the intake locks grip the valve , the exhaust do do not. take a lock and grip it, then rotate the valve, i've done that, just food for thought
Yep, multi groove locks touch each other when they are assembled so they don’t totally lock on the valve stem. It makes them rotate.
I know guys use that style lock with solid lifters but every time I’ve seen it done it beats the hell out of the valves and locks in pretty short order.
Hydraulic lifters don’t mind because you don’t have the lash beating on the lock.