I've also test fitted the Z28 wheel (same size/offset) it will barely, barely fit with a street alignment. If the purpose of doing ZL1 1LE wheels is to look good, should be fine. If your purpose is to track your car, you'll need a 3-5mm spacer minimum if you're going to track align your car, which if you're going to run an R-compound tire and not track align your car...wtf are you doing?
