Master cylinder questions

[shifty]

* Anyone know the bore & stgroke of the stock master cylinder on my truck (68 stepside SWB w/all drums)?

* Anyone have any luck using one of the aftermarket MC's from Summit (or otherwise) with our trucks?

* Do all master cylinders basically have the same mounting holes/footprint, or should I be careful? It looks like all MC's I've seen use a diamond shape base with two mounting holes.

I might have more questions, but this is what comes to mind right now, and I have been hunting for answers online with very little luck. Any time I mention "stroke" and "bore" i get engine related websites.

[boraxman]

Ttt for you, watching with interest.

[shifty]

I'm asking a lot of this based on what I'm figuring out as I'm adapting my hydraulic clutch for the truck. If I can get a legitimate answer and better understanding of this setup, I think I could write up a nice couple of FAQ threads on "choosing a brake MC" and "picking up a clutch MC"/"installing a hydraulic clutch into our trucks", which I'm sure would benefit a lot of people.

I'd love to be able to go to Summit and get a $50 Wilwood or other MC with integrated resevoir to use for both my hydraulic clutch *and* for my brake system.

I'm just having a bit of an issue tracking down stock stroke/bore numbers and fitment for the 67-72 pickups.

I understand you can use basically any MC that will bolt up to the trucks as long as the BORE x STROKE is greater than or equal to the stock setup. The tough part is finding out what that/those values are, I think?