If you don't think deadlifting will put mass on your arms, then you are completely retarded. LOL you probably learned everything you know from your high school gym teacher.
You can not target any specific portion of a muscle. It can't be done. Have you ever heard of someone making the front of their bicep bigger by curling a certain way? No, and your chest is not...
The shape of a muscle is controlled genetically. A muscle, like any other structure or organ in the body, has a certain set of parameters in which it can grow. If it didn't, it would be, well, more...