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I just figured out the casting number on my master cylinder (had to really clean it off). It is #2660809. That should be for manual drum brakes on all 4 corners 67-70 B-body. I contacted Fenco direct - they said that they make one master cylinder for my car (the one I bought) M1323 or remanufactured NM1323. They said it will work on both drum & disc brake front! Does this sound right to you guys?? It does have different sized resevoirs on it like most disc brake / drum brake m/c that I've installed on other makes. Thanks in advance for your expertise!

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The Master cylinder with the bolt on cover is for DRUM brakes, a disc brake master cylinder has a much larger rear res because of the volume of fluid that goes thru the front brake circuit. the rebuilder is wrong in telling you what you have is for both , it may work , but safely as the front brakes wear ????

Maybe dr. diff or andy will chime in with what master to go to.

One question , do you want factory appearance ?

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