going back to caster change, when i measured bump steer on my '66 to see what the suspension does as it moves i found it changed Caster by 9 degrees from full droop to full bump and about 4 degrees over about 2 inches of suspension movement around ride height. (this was on old rubber bushes)
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and this is what i found on bump steer
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i think bump steer is actually built in to cause the steering to understeer as the car leans into a corner making it safer for the ordinary driver.
just dropping the K frame by 1/4 inch reduced bump steer in a straight line but i also tested it on a slight lock and bump steer is back.
UK roads are just awful for pot holes so for me dialing out bump steer and gaining more caster at a normal ride height is the goal.