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I've bump steered my Barracuda, and I don't have massive bump steer. Pretty close to what a new Challenger is. Have you bump steered your car yourself?

Caster gain typically comes from anti dive in the upper control arm. Stock coil spring cars have similar anti dive angles. There are templetes that alter caster gain by removing anti dive (guldstrand templetes)

Can you show us the measurements of the Caster gain on a stock:
1970 Chevelle?
1970 Mustang?
1970 Camaro?
And compare those measured on popular Mopar models?

Porsche 911's had torsion bars up to about 10 years ago. Sprint cars all run torsion bars.




Let's see...

Yes.

I agree, but in so saying you agree that the upper a-arm is moved from it's stock location.

Nope, don't own any of those. And don't care, not comparing to a Chevelle/Camaro/Mustang.

Some sprint cars do use a torsion bar, but I've never seen one. Also, many sprint cars use a Jacob's ladder rear susension. Those boys aren't right...