Is there such thing as a good lifter?

Bakerlite said
I understand what your saying. The primary operational factor is RPM/bleed down time.
What I am saying is that the lifter will fill with oil more efficiently at 80psi than it will at 15 psi. Remember, it's bleeding down and filling up.
I would suspect it has an effect, if only a very small one.

Viscosity has an effect on the original Rhoads lifters. Rhoads say's it doesn't.
I 've ran enough of them over the years and I know for a fact there's a difference in how they work at lower rpms using 20/50w vs 10/30.