Max lift with stock valve length?

Minimum? Depends on the lobe & rpm..similar really. How much cushion do you want and what's the needed service life..all goes into your parts selection as much as anything else.
I use KMOTION K800 double with a small .575 lift @1.5 street solid roller and have turned it to 7000rpm many times, on average about 6400rpm. [email protected] installed height and using a comp cams 740 retainer...it sits @220- 225 lbs seat and around 480lbs [email protected]
2.02 11/32 valves. I would not run less than that. Chevy guys get away with running less pressure because they don't have things like 3/8 valves, big retainers, heavy 2-3 groove locks and 59° lifter banks.... they have 11/32 valves, little retainers, 1-2 groove locks, smaller lifters and 'iirr' 44° lifter banks, skinny shorter push rods n yadda yadda.