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Hi john
I would say between 5.5 and 7 degrees but I also had adjustable top mounts at the time.
Turn in and corner grip is dramatically improved with these arms, obviously you would need a good geometry set up too
Do you have any idea what caster these achieved on your car ?
thanks ---john---
After speaking to Simon at chevron today I can tell you that these arms on their own would give you 4.5 - 5 degrees of caster.
A standard sti alloy arm gives you 3 and chevrons modification adds 1.5 - 2 degrees.
With the machining the wheels sit as far forward as possible to aid turn in and high speed stability.
Hope that helps you more.
I spoke to carnetix in Melton Mowbray about fitting these to a classic and they said they would fit.
Obviously you would need your geometry setting up too.