the cars with damper blades have more castor than later cars.
I always thought it was the other way round? As I understood it the early cars with steering boxes had steeper head angles, which although gave very light and precise steering, did leave the cars prone to steering shimmy or the renowned "St Malvern's dance" if the damper blades weren't set up correctly. Certainly my steering box car wobbles like a wobbly thing if my damper blades aren't adjusted correctly
With the change to steering racks the head angle was increased, (I think to 8 degrees) giving a longer trail - more stable steering with a more planted feel. When the wider tyres were also fitted it rendered the damper blades unnecessary.
To my mind a steeper head angle gives a shorter castor distance and a shallower angle a longer castor?
