is that RICARDO's chest or not in Khan???
It is mentioned more than a few times in the SCE ST:II TWOK DVD special features that it is Ricardo Montalban's real chest.
It has been widely debated that Ricardo Montalban's chest was actually a prosthetic piece that he wore during the film. In the director's commentary in the special edition DVD, Nicholas Meyer is quoted as saying that it was, in fact, Montalban's actual chest and that he was a very muscular man who worked out. During publicity for the movie, during an appearance on "The Tonight Show Starring Johnny Carson" (1962), Montalban explained that he was able to achieve the look seen in the film by doing push-ups. "A lot of push-ups."
I guess seeing is believing...