Largest Wheels On Stock?

I Have a question, I just bought a 96 Impala SS, and I was wondering if someone new the biggest size wheels you could put stock onto it without having to lift it any. If anyone knows this that would be wonderful. Thanks

The rears can accommodate a 295/40-18 on 18x10 wheels without clearance problems. That also maintains the speedometer accuracy fairly close to original calibration. The fronts don't like much bigger than the stock 255-50-17 without work.