Another manual disc/drum ??
I have a manual disc/drum set up on my 66 chevelle. Everything is stock gm parts.The front disc are from a early 70's monte. I am looking at 2 different master cylinders for it. Both NAPA part numbers.
TS 101578, it has a 1" bore
TS 101639, it has a .9375" bore.
Witch one do i use and why????