Is it off a rear disc setup? If not, you'll probably have to remove the residual pressure valve to use with rear discs. When you do that you can measure the cylinder bore and report back.
Hey Giuls1, no it's a valve inside the master cylinder. Do a bit of a search on Residual pressure valve, or RPD, and it's a fairly common issue with a lot of rear disc brake conversions.
It's designed to keep a little bit of pressure on the brake shoes, so that the return springs don't pull the shoes too far off the drums.
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