Need input from big cam users.

As far as different lash settings, expansion would be the same on any of them so i'm speculating that it has more to do with lobe design on the initial ramp as to not punish the lobe or lifter on a specific design.

Back to your issue......all these larger solids require a dual spring which you do not have for some reason. Was it overlooked or is your cam not as big as we might think?????

I would do as we talked yesterday and set the valves cold somewhere in the .020's and do a compression test and see what the numbers are. Then get another vac reading. Detective work to identify as many unknowns as possible is where you need to start. I have lots of ideas, but that will just muck up the situation for now.