master cylinder

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72duster72

72duster72

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i am going to change master cylinders i have h/k disc 10in drums rear does anybody know the bore size of stock master cylinder. i what to change because mine leaks during the autocross. any help would be great.
 
Factory master was 1" bore for K/H disc drum.
 
Check rockauto. They give bore sizes for most MC's. You didn't tell us the year or if you have a power booster. It is kind of a preference thing. If a booster, the MC bore should be smaller. That has to do with the lever in the stand-off brackets.
 
1969383S said:
Factory master was 1" bore for K/H disc drum.
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No, A-body disc master cylinders were either 15/16" bore or 1-1/32" bore. B-bodies came with 1" bore (also 1-1/32 and 1-1/8), and all these master cylinders are interchangeable, so you could wind up with any of those sizes if you wanted. Note that the pushrods will be different for power and manual, and some may not have the correct piston stop for manual applications.
 
mvh said:
No, A-body disc master cylinders were either 15/16" bore or 1-1/32" bore. B-bodies came with 1" bore (also 1-1/32 and 1-1/8), and all these master cylinders are interchangeable, so you could wind up with any of those sizes if you wanted. Note that the pushrods will be different for power and manual, and some may not have the correct piston stop for manual applications.
Click to expand...

My bad (mvh) according to the Manuals you are correct.

My question is what gives??? Same calipers and essentially all is the same including the Booster for PB. The one difference is or may be the frame T/ safety switch, or maybe in 72 it is the frame T/safety switch/proportioning valve.

Attached is a the specs from 1969 first 2 pages and 1972 second 2 pages. Makes little or no sense to me.
 
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