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The 59 AB engine has a vacuum port in the manifold, just below the carb mount surface. The vacuum source is used for the advance brake and to drive the wipers/ There is a special banjo bolt fitting that connects the brake line to the manifold an has a place to connect the wiper vacuum hose. Somewhere I heard or read the the weird banjo bolt act as a silencer? Not sure on that. So, is it possible to drill and tap a port in the same location in a 49-51 manifold?