Anyone know the bore size and stroke length for the 1200 sedan? I need a new one and Wilwood has some aftermarket ones. 3/4" to 1". I'm thinking a 7/8" will work fine. I have not yet pulled my old one out.
Link to Jegs and Wilwood master cylinder.
Wilwood Master Cylinder

I dunno the stroke, but the standard 1200 M/C is 11/16. I wouldn't advise going bigger unless you're running some pretty big brakes. Otherwise you'll need a booster. I just run the standard 1200 M/C with my S13 front brakes, and the pedal feel is awesome.

I have standard disc brakes in the front but 320 truck drum brakes in the back. So 11/16 is smaller than the Wilwood 3/4 bore so maybe the 3/4 would work for my brake setup? The 7/8 would be to much?

Standard m/c in USA is 11/16 for disc brakes.

You can use a B310 cylinder it 13/16. This increases pedal effort, but reduces pedal travel for a "tighter" feel.Brake master cylinder

Just drill two holes to fit it or use the booster adapter.

Im just going to go with the Wilwood 3/4. Should work fine. Thanks.