Art Morrison IRS install, 67 Camaro

[TheJDMan]

David,
What is the WMS to WMS measurement on that IRS? Just curious if it is similar to a stock rear end width or narrower.

[sjaroslo]

David,
What is the WMS to WMS measurement on that IRS? Just curious if it is similar to a stock rear end width or narrower.

According to the AME catalog, the IRS is available in 4 track widths: 55.5", 57.5", 59.5" and 61.5" (wheel mounting surface to surface width)
Half dozen ratios between 3.54 and 5.13
Brake options: 12.4" rotor with floating caliper, Wilwood 14.2" with W6A caliper or 14.4" with OEM Brembo caliper
Minimum whel size: 17" with 12.4" brake rotors, 18" with Wilwood brakes (only certain wheels will work)

[efs69]

You got a lot done David. It is looking great. Probably a little easier after doing Mary's.

[David Pozzi]

This was lots easier & I'm better at it now that I've done Mary's. I'm doing trunk close out panels now.

[compos mentis]

67 Camaro RS that will be faster than anything Mary owns.

David,

That part of your signature should be bigger...much, much bigger.


lol

[ChevelleNV]

67 Camaro RS that will be faster than anything Mary owns.

David,

That part of your signature should be bigger...much, much bigger.


lol

I think he's afraid Mary will see it if its any bigger

[David Pozzi]

I think he's afraid Mary will see it if its any bigger

That was my intention. I tried to sneak it in to see how long it took for Mary to notice. It took a long time!

Rod, nice tank! What do they do inside for fuel slosh?

[David Pozzi]

Trunk nearly done. Mini tubs are next.

Trunk cut.
The lower trunk floor, I bent up a flange for strength and to give me something to weld the filler piece to.


View from underneath


I found there would be no room for my hands to reach the cradle mount bolts, so I cut out a triangular area on each corner & will make filler panels.


Test fitting the corner filler pieces. I Made them raised but dropping down towards the center so I could have a little extra room underneath for access to the cradle attachment nuts.


Filler panels


Nearly finished trunk. I pushed the front portion up to make room for the rear cradle. On Mary's 73 Camaro, I made a whole new piece but it was very difficult to get in there to weld the forward edge. This way it's still attached & less work.

[Motown 454]

It looks great David. Very interesting install.

[silver69camaro]

David,
What is the WMS to WMS measurement on that IRS? Just curious if it is similar to a stock rear end width or narrower.

It's 59.5", so basically stock. This is mainly done for packaging reasons, as it allows the UCA to clear the frame rail well. I know some like a little more dish in the wheel, but having a little wider track width is easier on the wheel bearings and reduces bushing deflection under power.

[Eric Howell]

Great, now Mary will be even faster Guess a lot of driving school is in my future.

Thank you for all the info and great write up. Very informative. Guess Matt did an awesome job as usual since Mary ran leaf springs forever!

[dhutton]

Any updates David?

Thanks,
Don

[dhutton]

Did a test fit of the IRS and wheels on my 69. 12 inch wheels with minitubs and I am stretching the rear quarters by a little over an inch to get a little margin. Planning on a 345 tire.

Don

[David Pozzi]

I've done the left side quarter stretch by installing a replacement "skin" panel. Working on the right side now.

[dhutton]

I knew my post would bring you out David. Good to see your photos. Have you decided how to run the brake lines etc?

Thanks,
Don

[Rod]

i've done the left side quarter stretch by installing a replacement "skin" panel. Working on the right side now.

awesome!!!!!!

[David Pozzi]

Don,
I'll probably run them down the sides, thru the crossmember, then up the rear floor with a bulkhead fitting on each side like I did on Mary's car below.

[grendel]

What rotors did you decide to run? I want to stick with the stock Brembos. Does a ZO6 rotor match the stock Camaro in rotor hat e-brake and Brembo cast in abutments?

[David Pozzi]

We run on 18" rims, so went to Baer 14" rotors & their 6R calipers. The E brake works. Morrison sells a Willwood setup for it.
The Camaro has a metric bolt circle where the Corvette hubs used are the old Chevy bolt pattern. I think the two are super close. The Corvette hubs used have a larger center register than the Camaro. I had to bore the rotors to fit. AME normally uses a Willwood kit to fit with everything modified. I'm using Baer 6R calipers and 14" rotors. Baer came up with this kit to fit the AME IRS for us, since we wanted to stick with their products. It's extra work to squeeze 14" brakes inside a 18" rim, using the 5th gen Camaro knuckles.

I may route my brake lines to in front of the fuel tank. It would allow me to remove the calipers with lines attached, hang them by wire, then drop the IRS out. The way it is on Marys car, the brake hoses must be removed, but there is less motion of the hose by following the lower forward link.

[grendel]

We run on 18" rims, so went to Baer 14" rotors & their 6R calipers. The E brake works. Morrison sells a Willwood setup for it.
The Camaro has a metric bolt circle where the Corvette hubs used are the old Chevy bolt pattern. I think the two are super close.

I may route my brake lines to in front of the fuel tank. It would allow me to remove the calipers with lines attached, hang them by wire, then drop the IRS out. The way it is on Marys car, the brake hoses must be removed.

What radial mount did you use to put the Baer 6R onto the GM 5th gen Camaro rear knuckle? I talked with Baer and the only kit that have uses a 15.5" rotor. I'd like to stay stock 14.4 Camaro with the internal e-brake.

I can confirm that the bolt patterns are super close. I put Corvette wheels on the Camaro hub, since the Camaro rotors would not fit over the Z06 hub.