/6 Torsion Bar Question

So I bought a set of used /6 torsion bars for my strip car and was about to install them ... looked down the axis of the bar and saw that they have a bow in them! In other words, they are bent in the middle ... both of them. They are in great condition and don't look abused in any way.

Is this normal? Is there a natural bow supposed to be there? I'm thinking no?