If you need to dimple the headers you probably would have needed to dimple the headers anyway.
For example, let's say you've got the .85" V8 bars and upgrade to the 1.12" torsion bars I have. So you take 1.12", subtract .85", and divide that in half because we're talking about the radius for clearance. That's .135", so, just over an 1/8" difference in clearance. So going from the smallest v8 bar to a bar larger than many would run on the street and you're talking about barely over an 1/8" difference in header clearance.
I'm not saying you won't have to dimple the headers. I'm just saying it's hardly worth considering. I did have to dimple the headers on my car, but I would have had to dimple them with .92" bars too.
