I have a stock set of 15" z28 wheels on my 1985 z28.


What is the biggest set of common, cheap 4 wheel discs I can do.

Can Ls1s front and rears fit?


If not what about LT1 front and rears?

The LT1 rears should fit. I have checked them with the 15" snowflakes I intend to use and they do clear. It is known that these fit most 15's. However that means not all so be careful.
I have not checked into the fronts.

heh, NASCAR fits some pretty big brakes behind their 15" wheels... though... the way they do it probably costs more than most brake kits :-p