- Oct 4, 2014
- Reaction score
- Minnesota, USA
- My Car
- 1972 H code fastback Boss 351 clone
Good Morning Gents and Ladies. I have yet another question. As I am sure you can tell I am gathering parts for another repair/resto. Last night I had my wife order a master cylinder and she says there are 2 available. One has a 1" piston bore and both brake line holes are 3/16" I believe. The other has a 15/16" piston bore and the front brake line hole is bigger than the rear. Which one is technically correct for a 72-73 Mach 1? I have a pic of the 1" bore MC.