I would have never have thought about gaining or losing movement. I would have more thought the Gap would have been needed for heat expansion.
Learning...:popcorn:
What I am hoping to learn is whether there is more than one style of single lock.
I only know the race style. In the race style there is a gap so that the locks are gripping the entire end of the valve. The taper and the spring pressure are forcing the locks onto the valve stem.
I thought many years ago that I read that comp cams pioneered the 10 degree lock to spread the spring pressures over the retainer better. Even many more years ago a friend blew up his ford 302 when the locks pulled right through the retainer and dropped a valve
Into the cylinder. But I also know that the chev v6 engines use a lock where the ends do not touch.
