"Deep Throat" was the nickname given to the source inside the Nixon administration that provided information to Woodward and Bernstein (Washington Post newspaper reporters) that uncovered the Watergate scandal.
Of course there was an X rated movie that came out around that time... I'm sure that one does not have to do with the other
Interested in the motor, unfortunately that picture doesn't tell me anything about it! Which is why it was released I'm sure..
Tom M