Okay so I have an 87 custom made 300zx & I want to know what rotors will fit the car. I have heard that the 370z rotors fit but I have not yet tried that. I need as much stopping power as I can get as I have a 383 stroker & some nitrous will also be going into the build. I'm almost finished with the car but I just want to know if there are any bigger sized rotors that will fit my Z.

CHECK THE CHEVY SITES BRO.

Lol, Chevy sites won't help with brake rotors. They sell conversion kits, like this:

https://www.ebay.com/i/351696217896?chn=ps

the 88-89 turbo z31 had the best brakes of all the z31's. Beyond that, it's a 5x4.5 bolt circle , the Z32 community often uses 3000gt rotors with brackets to relocate the calliper. Tons of choices for rotors the trick is fabbing a mount for whatever calliepr you run with them. The rotors are only half the equation, actually less than half, pads and lines.