[ESPCamaro]

How thick are the spacers that SLP installed on the SS cars?

And because of their location, one would have to raise the rear of the car MORE than the thickness of the spacer to maintain the same travel as before the spacer. Isn't that correct?

[sgarnett]

The stock bumpstop is fairly close to the wheel. You will get a little more travel at the outer edge of the tire in roll, but assuming the PHR and roll center is roughly on the same level as the axle, the outer edge travel will be roughly (travel at bumpstop)*(distance from outer face of tire to center of pumpkin)/(distance from bumpstop to center of pumpkin).

I'm running slightly softer-than-stock rear springs, the car is lowered 3/4", and I've run 275 street tires, 275 Nittos, and 275/45-16 Hoosiers (short but wide) on wide rims. Other than the hump at the front inner fender that we all have to beat in, I don't get any rubbing with bone stock stand Z28 bumpstops. I do have a "real" PHR, but other than that I'm not sure why SLP ever bothered with the spacer - it isn't needed.

Lonnie, if you have to raise the tail of the car 1/2" to clear the 335s, it doesn't seem like that great an idea. You're going to raise the CG and (ignoring whatever other plans you have) the roll center. Even if you fix the roll center, raising the CG will probably cancel out most of the advantage of the wider tires.