Setting valve lash with new, non filled hydraulic roller lifters

Bakerlite said

I started getting some Comp lifters that would not bleed up. Had 3 in one set.. So I started oil filling them and testing them before installation. I use to prime them years ago, but got a little lazy and just fitted them as recommended.
When they don't bleed up, it just kills the lifter, especially with heavy valve pressures.
Think about this, what do you think happens to the lifter in the engine when you remove the rocker gear and then put it back on?
When you float a valve and pump up a lifter does it stay pumped up for ever?
Ever adjusted a tappet in a running engine by backing off the tappet until it clicks, then tightening it down till it stops?

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I wasn’t questioning your intelligence, sorry if it came off that way. I was just curious why/how you came to the conclusion that it’s best to fill/pump them up prior to installation. It can be done if you know what you are doing. I guess I am the exception to the rule because I disassemble every hydraulic lifter that I install to clean and inspect them, and make sure the check valve functions. You’d be surprised what I find in new hydraulic lifters. And FYI I know what happens when you float the valves and pump up a lifter, and yes I have adjusted them with the engine running. Almost burnt down a buddies garage in high school doing that on a 67 gto. Big oil fire. Never again.