New set of SB hyd. lifters

could half of them be for intake and the other half for exhaust? LOL!

The important thing is if all the cup sizes for the pushrods are the same. It looks like some of them just touch the clip and others run a little under it. Could this be vairition in the way the clip seats? -(It's an illusion and we don't like it...).

Then what is the purpose of the top groove that some of them have and others don't? If it is not necessary, they could have stopped machining it as a cost reduction (why machine it if you don't have to?). Physically the diameter and overall length look the same.