Don't believe everything you read on the internet... except this.
It is 4" prior to cranking your t-bars, you can even 'test' this by measuring your old knuckles and new Superlift knuckles, they are exactly 4" longer.
You can of course get more height in the front by further cranking your t-bars, but it's not recommended. There is an actual equation that Superlift gives you to make sure your torsion bars are in the correct spot.
LCA Crossmember Bolt to ground - Bottom of Knuckle to ground = (Somewhere between 3"-4").