Max lift with stock valve length?

I could be wrong and altho I havent looked at Jeremiah's math. I just use the mfg spring rate per inch and calculate it accordingly. But this is new stuff to me lol
Would really like to know where data like this comes from? Your own testing, or..? I’ve tried searching for specifics like this and apparently don’t know how to Google. Maybe there’s a calc or software package for it? I know the old lb/.001” lift rule of thumb (basically what my cam came with from comp), but would love something more accurate, especially when using the thinner wire with higher frequencies and such. Thanks!