LS1 Brake Rotor Thickness

[barno68]

I have the LS1 conversion up front on my '71 Camaro and am having issues. It is dragging to the point that the car does not move when put in gear, I have to give it gas and then it slows right down when the throttle is released. I pulled the aggressive pads and swapped in some cheap semi-metalic and still have the issue. The pistons are pressed in fully and the pads barely clear the rotor putting them on.



I noticed that there are two rotor thicknesses listed for these brakes- 1" and 1 1/4", I have the 1 1/4" ones. How do you know which to get, a 1/4" seems a lot of piston movement between the two.