Kelsey hayes front rotors correct master cylinder

I used a 73 (IIRC) master cylinder when I did my m/c from the one pot to a dual. I had factory K-H. The 73 has a 1 1/16 (inch and a sixteenth) bore and I wish I would have gone with a little smaller, maybe 7/8. The 7/8" is probably a little easier on the leg!

Nice looking setup you got there!