Re: What master cylinder/proportioning valve to use?
In comparing AC Delco master cylinders from a 68 (drum/drum) to a 72 (disc/drum) on Rock Auto, they are different part numbers. The bore is different too - 1" on the drum/drum vs 1.125" on the disc/drum and the reservoir is taller. It's a $40 part so that's not too bad.
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