[my427cobra]

This was a great thread. I learned a lot from all of you who contributed as I collected the info I needed to proceed with my IRS scratch build.

To summarize, here are the key specs/dimensions I learned about the 427 Cobra IRS:

Rear Upper Control Arm (UCA) length: 11.4” to 11.5”

Rear Lower Control Arm (LCA) length: 12.4” to 12.5”

Vertical distance between the UCA and LCA at the inner (frame) mounts: 10 to 10.5” (dependent on the UCA downward slant towards the rear for anti-dive)

Rear Upright/bearing carrier total height between the UCA and LCA mounts: 12.35” to 12.43”

Rear UCA mount on the upright to the axle C/L: 6.73”

Rear LCA mount on the upright to the axle C/L: 5.62”

To summarize the rear set-up specs:

Assume a 5” ground clearance (at the rear of the frame) with 15” wheels/27” OD tires

Rear Toe-in: 3/16”

Rear Camber : -1.25 deg

Rear Upright Castor: ?

Rear Anti squat: UCA 3.5 deg (UCA frame mount slopes downward to the rear) LCA 0 deg

So the only remaining question I have for those that have helped me so far:

What amount of static Castor is built into the rear uprights?

Thanks to all who have helped me out.

Cheers
Greg