1-1/2 - 2 threads showing is it!
5 is way to much! Mitch! Re-do your pushrods!
Useable plunger area is the first and last .010. Of plunger travel. Better to have a little more than a little less. You don't want to run it to close because you do not want the plunger to travel fully closed or depressed all the way down. This will damage the plunger. You do not want a litter coming apart in a running engine.
A little extra preload is not the end all.
Cracked runs it close, Rapid Robert runs it in a safer zone and still has some room.
