I have a the roller perches, with the 620 1" drop springs fromlaurel mountain mustang, I also did the shelby drop.

My problem is that the springs have settled so much that the tires now rub a lot and my long tubes drag on bumps.

I am running 17 x 8s with 215-40-17 tires. They are really low profile and they still rub. Is there a spacer that i can get to go in between the spring and the tower to riase the cat 1/2 to 1"?

 

You can relocate the spring perch location outward about 1", iirc, to pick up about 1/2" in ride height.

Are your fender lips rolled? What's the backspacing on the rims you have?

 

no matter what he does with bs or fenders, the longtubes will still rub.
i just wonder that they rub because the tyre are tiny. i calculate for 215/40R17 only 23.7" where stock is close to 26.
215/50R15 would be more stock height (25.5"), which woold raise the car by an inch (probably not standing because of flat spot, but driving). That might help with the tubes, but then again the whole lot shouldn't rub on fender in the first place.
So Tad might be right in assuming it's wrong bs as well

 

Backspace is the key here, you may have more wheel than will fit comfortably.

Mustang Wheel and Tyre Chart

 

i am running a 4.5" bs. the car sits really low. there is only about 2" between the long tube and the ground. The tire is tucked tight up inside the wheel well. I will post a pick when i get to the car later today. It is really low. the springs have settled at least an inch since i put them in.
Initially when i installed the prings it was perfect. i did think they would settle that much.

 

That's one of the reasons I don't recommend drop springs. The 1" relocation of the upper arms (the Arning drop) lowers the front 5/8", and that's enough. The geometry change of the "Arning drop" is far more important than lowering, so I'd do the drop and use stock height springs.

Arning/Shelby Suspension Drop

 

well i definatly want my car low. i actuall like the looks of it now, hoever it is just a litle too low. if it would not have settles it would have bben fine.

but to get back to my original question, is there a spacer that will alow me to raise the car a little. i know with most trucks spacers are available to level the front end

 

Yes. If you call Laurel I believe they have a larger spacer for the springs, they come standard with a 1/4". I'm basically running the same setup, but without roller perches. My fender lips are rolled and it's tight, but the biggest issue is backspacing.

My LT's are basically flat on the bottom now and dented from a run-in with a large piece of asphalt in the road that smashed a primary. They're getting replaced with a set of Doug's Tri-Y's real soon.

As far as the use of drop springs, the upper arm drop will make a bigger improvement than drop springs, and the front does sit rather low. The problem is that nearly all of the performance springs out there with higher rates are 1" drop springs. The lower CG over the front from the drop springs though does help to reduce understeer and make the car handle better, but that only matters to guys like me that prefer to race through turns. At some point I MIGHT go to a Global West Negative Roll setup, or I might put a set of TCP coilover's on, since they have adjustable ride height. Not only can you set ride height that way, but you can put the car on 4 corner scales and adjust the suspension to get even weight distribution to account for a driver, battery location etc etc.

But yes, I have the same problems. The tire issue isn't really one for me, it's just a tight fit. The headers, you'd need a set of Doug's LT's or Tri-Y's or someone else who makes a set that fits tight. Doug's Tri-Y actually doesn't come quite all the way down like an LT does, so you can run the exhaust piping tight between the frame rail and trans, then under the trans crossmember.