Putting back together a 172 engine and just had noticed the two holes for pipes between the intake manifold and the throttle body. Assumed one was for the servo vacuum and the smaller one at the front for the valve in the airpipe. To sort and airbox got an Induction kit delivered today there is a big pipe coming off the actually inlet hose obviously for a vacuum hose but which one? Have not noticed anything for the fuel vapour recirculation hose yet. So if anybody could clear it up and tell me which goes where i'd appreciate it as seems the ends of the servo pipe is missing.