I wouldn't recommend anything over 15/16' for anything without power brakes. I put either a 1 1/32" or a 1 1/8" on my Dart with manual disk front and back and it scared me in the driveway. Both hands on the wheel and both feet on the brake pedal to make it stop. The 15/16" I got from Dr Diff is much better, but when the time comes to replace it, I'll use a 7/8" bore.