I would tell him to go do some homework on these forums by doing searches for "lift","lifting", "OME912" and "torsion bars" and maybe have him look at some prominent member profiles and he'll have all the answers he needs. I think you could just call the people who make OME912s (ARB I think?) and ask them what the spring height is. I am sure one of the many lifted people here will chime in with stock vs. OME912 height, and I am pretty sure your search will turn up a thread discussing this very topic. Triathlete did a really good write up you will find in the how-to section of the board that gives a step by step process on doing this lift. It has a lot of supporting evidence that: -1. The lift does indeed work, and 2. It will be able to be re-aligned afterwards.