Torsion bars

Bonnetron said
I believe that the book you are referencing is one of the textbooks I had I my Hi-Po drivelines class in college. And you are right, it has a lot of valuable information. I just feel like you are misunderstanding the stored energy part. Light rate springs release their energy through a longer travel, but don't store MORE energy. The weight removed from the front of the car is based only on the power that the car is able to apply to the ground, which would be the same no matter what spring is in it. As soon as either spring is fully extended, the unsprung mass begins working against weight transfer. The lighter rate spring just allows more weight transfer before that happens

And that is the type of answer my poser was posed to illicit.
The 440 bars will come off the preload almost right away and it will take many strong men to lift the the front end 6 inches, because the bars are unsprung and NOT helping.
Whereas the 6-cylinder bars have lots and lots of preload, so will help to lift the front end for longer perhaps requiring fewer buddies to get the front end up.
My 1.03 bars have very little preload on them. In fact the one side was difficult to install period with perhaps just 1 turn, (it was a long time ago), required to set the low height.