Torsion bars

Have a big block 69 A body, the torsion bars are original, there is nothing wrong with them, car sits fine and suspension feels good but am I overdue replacing them? At what point is it wise to replace?

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Have a big block 69 A body, the torsion bars are original, there is nothing wrong with them, car sits fine and suspension feels good but am I overdue replacing them? At what point is it wise to replace?

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When they start to sag and you need to crank them up