Sorry, most of my pictures are held hostage by Photobucket so blame them if you can't see.

I am going to have to retract my previous statement of possibly fitting 335's in the rear. My setup is actually rubbing in the upper wheel wells upon further inspection. It must be rubbing due to the body roll while cornering. The rubbing is just slight on the tire but, is no way ideal.

315's are definitely attainable, no doubt. With leaf springs, one will have to relocate them inboard 1.5" using Dr. Diff's kit and roll the rear fenders. Once those two things are done its just a matter of finding the correct offset wheels.
I am having more issues fitting them in the rear than in the front haha!

Unfortunately Dr. Diff I believe quit making the 1.5" offset kits according to correspondence about a half a year ago.

Wes

I just called Cass and the reasons he stopped making them were because too many people complained that they interfere with a full length exhaust and that they will leave two small dimples on the `Cuda rear valance.

That's too bad, it was a nice product. If enough people ask him nicely though...

Here is the damage from the 315 rubbing in the rear, minimal but not at all ideal.


Some rear fender rolling progress

Eastwood says their roller does not work with thick double wall rear fender sheet metal of most muscle cars but that is all baloney, it works fine, just need a big F'ing hammer also.



Before shot from a while back

This mod is not too bad since I don't have nice paint. Believe me I wasn't gentle on these fenders at all as they are not that easy to fold up. A few whacks of a big hammer does the trick to bend the metal up, then I used the roller fender to get the shape I want. I took my time as didn't want the rear fender to concave in permanently as it would flex when rolling at a certain spot.

Not too bad as I have never rolled fenders before. I still have to do the driver side and I think it adds about an extra inch of clearance. I'll post up actual measurements of before and after at a later time.
My spine is still killing me due to being crouched down under the fender all day haha!

just wait until a year or 40 passes, then come back and report how your aches feel ! only a tad of experience talking here.......

Rylis -- nice work!! Mine are flushed/pulled... still appears stock...

I finished the driver side and took before and after pics:
Before

After

Added about 5/8" additional clearance

My advice when rolling the fenders is to take your time and check your work. I got a bit too greedy and the fender concaved in a bit. I had to pop it out from the inside and everything looks great now.

Why not use a mini tub and relocate the springs into the frame rails? US Cartool has a “kit” for it.

Because that would mean more time that the car is down and getting worked on again
which means less time on the road course

Thanks!

Right, I get it! Would it adversely affect handling?

Yes it would definitely would affect handling if one were to add mini tubs. If we did that we would also fit the widest tires possible maybe a 345 or even wider? The problem is that the fronts will only be 315's wide and it would cause severe understeer at the track.

Actually it might be a benefit because currently we oversteer too much haha!

345’s would look awesome.....but moving the springs in 3” or so each side would have no affect on the handling?

Moving the leaf springs inboard reduces the wheel rate about 10# per inch, so similar to running a lighter spring rate in the stock position.

Now, whether or not the butt dyno can feel a 30# rate change per side is highly subjective.

Only in roll, to be clear?

I don't see much reference to the fronts, any real issues there with fitment?

Looks great .

Function over form

This would be in both ride and roll rate because the mounting location is altered, impacting the geometric formula.

You are a member over many years I seldom ever disagree with, but this is one.

Leaf spring location relative to the tire contact patch does not change spring rate in ride, as there is not motion ratio other the 1:1.

You are a member over many years I seldom ever disagree with, but this is one.

Leaf spring location with a solid axle relative to the tire contact patch does not change spring rate in ride, as there is no motion ratio other the 1:1.

I have a pile of leftover 355's from this season if you want any for fitment testing.

355 square is where you want to be...

Summit $781/ea

Brand:Pirelli
Manufacturer's Part Number:2307500
Part Type:Tires
Product Line:Pirelli P Zero Corsa System Tires
Summit Racing Part Number:PIR-2307500

Wheel Diameter: 19 in.
Tire Size: 355/30-19
Sidewall Style: Blackwall
Tire Construction: Radial
Tire Diameter: 27.40 in.
Section Width: 14.00 in.
Minimum Recommended Wheel Width: 12.00 in.
Maximum Recommended Wheel Width: 13.00 in.
Directional: No
Speed Rating: Y
Load Index: 99
Asymmetrical Tread Pattern: No
UTQG Tread Wear Rating: 60
Traction Rating: AA
Temperature Rating: A
Tread Depth: 8/32 in.
DOT-Approved: Yes
Run-Flat Technology: No
Tube Required: No
Max Load Single (lbs): 1,709