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I got my Z28 setup from an SCCA racer who helped develop the DSSVs on the Gen5 with GM and GM had him move the mounts on the front shocks down 1 inch and only a half in inch in the back. He said the half inch of rake was to decrease the understeer. I believe the ZL1 springs lower the rear less than the front too, but only by about a quarter inch.
Justice Pete recommended a +5mm difference between the front bar and the rear bar to address understeer.
The 1LE has the same springs as the SS, so I think you have the right idea with changing springs.
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2010 SS - Kind of an On3 kit, CTR 78/80, CompCam 239/251 620/632 122+4, E85, Z28 suspension and ZL1 diff with Outlaw axles. Gen6 ZL1 brakes.
2011 Vert - 416/w 230/236 .612/.602 115lsa, 1LE suspension w/32mm rear bar. Z28 diff. Gen6 ZL1 brakes.
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