The fellow over on Rennlist that did the measuring is Jeff33702, it's the most complete and I believe accurate comparison of the mixture of various 964 and 993 parts that i have seen
A summery
Quote:
Add 993 long to 964 while STILL using the 964 uprights (No one is doing this on their cars, this is just for reference) pushes the face of the upright bearing surface out by abou 16mm. That's the long by itself.
Using 964 long with a 993 upright pulls the face of the upright towards the car (reduces track) by 8mm. This is what most people are doing and seems maybe adding a 5mm spacer AND then a slight struggle with the camber.
Using a 993 long with a 993 upright pushes the upright bearing face out by 8mm...because the 993 long is +16mm and the 993 upright is -8mm.
The moral of the story is - when using 993 uprights on a 964, you will reduce the track -8mm per side. If you move to 993 longs with the same 993 uprights, you will increase the track +8mm per side.
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993 uprights on a 964