King pin inclination.... Best left to the guy with the alignment rack.

http://www.stockcarracing.com/techarticles/scrp_0704_measuring_caster_camber/index.html

Jim

--------------------------------------------------
From: "Larry Alofs" <lalofs@GMAIL.COM>
Sent: Monday, November 01, 2010 1:02 PM
To: <vanagon@GERRY.VANAGON.COM>
Subject:      [VANAGON] checking castor

> Having replaced the rubber bushings on the radius rods on my '91 GL, I
> would like to check the castor, since it is affected by the rod
> measurement.  The Bentley mentions this and give castor specs, but
> does not seem to give any clue about how to actually measure or check
> the castor.  Maybe it's there and I just haven't found it.
>   Anyone?
>
> Thanks,
> Larry A.