What you are trying to do is adjust the PRs at least half the total lifter piston travel length. For the HD lifters this is around 0.200". So half of that would be 0.100". Depending on the TPI of the PRs you use, then that will determine the number of threads (turns) that you need to make to get that travel:
24 TPI: 0.100 x 24 = 2.4 turns
28 TPI: 0.100 x 28 = 2.8 turns
32 TPI: 0.100 x 32 = 3.2 turns
Some of us like to make the PR a flat or two further out than half the lifter piston travel so that the PRs inflate with less oil required. This usually means a quieter lifter. But that is a matter of personal preference. As long as the adjustment is somewhere around half the lifter piston travel, the lifter will work right.
TQ
24 TPI: 0.100 x 24 = 2.4 turns
28 TPI: 0.100 x 28 = 2.8 turns
32 TPI: 0.100 x 32 = 3.2 turns
Some of us like to make the PR a flat or two further out than half the lifter piston travel so that the PRs inflate with less oil required. This usually means a quieter lifter. But that is a matter of personal preference. As long as the adjustment is somewhere around half the lifter piston travel, the lifter will work right.
TQ