If your intake is already installed, you could try leaving the affected lifters at max lift overnight and hope your springs bleed them down. Didn't work for me. I made a fixture that consisted of a piece of 2x4 with a half inch deep hole in it for the cam side of the lifter. Then i got some 1/4" brass npt tube threaded on each end, about an inch long. Amazing what you can find at home depot ....one end received an end cap. Brass is softer than the lifter, and the endcap nestled nicely in the pushrod end of the lifter. I then clamped the whole mess in my bench vice and started pressing out the
oil. Nice and slow. Had to repeat twice for each lifter, but each lifter went from essentially a noncompressible solid to nice and springy. This is standard practice for me now, whenever i pull the intake. Frankly, it's probably ok if you don't bother doing this, and just add a half to full turn from zero lash. If the valve opens a bit, I'm sure it'll assume it's normal operating parameters under running conditions. It is annoying though, to clearly be opening a valve when you're supposed to be setting lifter preload. I've brought this issue up several times in the past, but it's never really generate d much interest from the gurus. Oh well....
Oh, do not prime your
oil system prior to setting preload. You'll have an engine full of solid lifters.
And use end stands.