Well, it would seem that this latest set of EZ’s has the pushrod slots moved towards the shafts compared to ones I’ve done in the past.

With the HS 1.6 rockers, the pushrods were still rubbing the head on the side of the slot toward the intake manifold.
The side of the slot towards the shaft, which is where the contact usually is with 1.6’s, had tons of room.

With 1.5 rockers there would have been hard contact with the manifold side of the slot.

In the past the interference was only up near the top of the slots....... but this set is extremely close for the full length of the slot.

Frankly, there just isn’t any reason this should be an issue at all.
The heads should be made with the slots adequately sized and positioned to clear the popular brand/ratio rockers.