What size torsion bars for a 383 in a 75 Dart?

abodyjoe said

anything smaller then 1" is too small for a small block car in my opinion.. the added weight of the big block will want larger bars

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The bar diameter and length sets the spring rate. Lower spring rate can be set to the same ride height as higher spring rate (within some limits.) The main diferences with a stiffer bar will be harshness of the ride and cornering performance.