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Re: 1968 GMC C20 Master Cylinder replacement question
I believe it's a 1 1/8 bore although it might be a 1" because of manual brakes. the proportioning valve you mention is really just a distribution valve as the front and rear get the same pressure in a 4 wheel drum setup. Personally I would just buy a new stock unit and paint it prior to install. Good Luck.
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Terry
1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC
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