Valve spring installed height

Spring range is 1.88-1.920.
So at worst, some are .020 shorter(1.860) than the “desired” height.
Depending on the spring rate, that difference in height may only amount to a few lbs of variation(if the spring is 400lbs/in, that .020 is 8lbs of force).

It’s not at all uncommon for a box of springs to have a 10lb or more variation between the 16 pieces.
Have them tested and then Mix n match……lower springs on shorter heights/stiffer springs on taller heights.

Then again……..is 1.88-1.92 really going to give you the “correct” spring force for what you’re doing?