68 corvette with drums?
I went from a 64 manual to a 66 booster set up. the 64 was a 15/16th dia piston where the 66 was one inch dia. my brakes were really touchy
whatever the original diameter was , you should stay that diameter.
any corvette master cylinder for a disc brake set up will be way too touchy because it will pump too much fluid too quickly to be manageable. even a small increase in diameter produces a large increase in volume.
try a dual master cylinder from a 67 lemans
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