Depending on many variables such as internal lifter clearances, oil viscosity, spring pressure, rocker ratio etc, the full lift & duration might NEVER be restored
Very possible, but after taking these apart the clearance between the shell and inner piston is really close. The oil seal was tight pulling the piston out, even with the groove.
Different situation in a running engine of course, but they seem to hold their position.
I couldn’t bleed them assembled by hand, I wasn’t game to squeeze them in the vice..