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I had to send it to Firestone to get it aligned and they did get it to within specs of the stock 560SL, but I no longer have the exact numbers. That's one of the things that has me kind of stumped. Normally I would say more caster for high speed stability, but the 560SL requires 10° degrees caster which is off the scale of all the hand type alignment gauges I have. So I wouldn't think caster woulds be a problem, but then I don't understand why MB requires so much.
The rear alignment of the 560SL is not adjustable but it was also measured to be within spec.
The front end of the V12 560SL has all new parts and sticky summer performance tires and the car feels like it handles better than the stock 560SL at low speed, but I attribute that to the all new components and tires. At above ~ 80MPH I'm more comfortable in the stock 560SL.
Theirs always the possibility this is all in my head. As I push the car further and further I do pay attention, but I really do believe that are things that could be done to balance it out better.
Basically this is a stock 560SL chassis with 200Lb added to the front sprung weight and 450SLC springs up front to maintain stock ride height. It also uses 129 wheels which require 20mm spacers up front and no spacers in the rear. Its riding on lower profile 225/50-R16 BF Goodrich G Force tires.
I am concerned about the effect of the wheel spacers up front only, I do have room to add 20mm to the rear and may try it.
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