[Formulajones]

Yes tire pressure plays a roll, and of course these measurements in the book are with stock bias ply tires in place as well.

I'd have to look but pretty sure that is all explained in the assembly manual because even the same type of car had different tire options for that particular model with different tire heights and different pressures, so the measurements change as a result.

As an example, I know when looking at the assembly manual for our 69Z, they had a specific tire that no other 69 camaro used (E70-15 wide tread Goodyear or E70-15 Firestone Sport Car 200's) and they are taller, yet the 69 Z/28 had a lower ride height than any other 69 camaro.