If the valves are stock sizes, there may be variations in height due to the condition of the head, and chamber casting cyl to cyl. Unless the difference is large, a lot of shops won't do anything to correct this, they simply shim the springs to get the seat load & ht. correct and let the adjusting system handle it(hydraulic or mech.). It's not "ideal", but has been done that way for decades as basic rebuild practice, and performed fine. If the valve has sunk too much, a replacement seat needs to be installed in the head, & brings the stem height back down.
Also, here is a factory adjuster in the cup of a 3/8" Crane Chrome-moly pushrod, they are not tight together.
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