Just by how its hooked up to the intake and lifter gallery cover I would say its a crankcase vent system. Looks like it would suck up vapors from the lifter gallery area and suck it back into the intake to burn it. Looks aftermarket but who knows. Any one else have a better idea ?

Ian

There is no denying that this gizmo is interesting and i do agree it is a "made up" PCV system for sure but why would anyone want this on their engine. I would take it off or just leave it on as a conversation piece. This vintage flat head in liner does not need this devise and was never engineered for such a devise. If you do not mind me saying so, take it off. Cheers. George

norontcan wrote:

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I'm also wondering what useful purpose it serves if it's a PVC system. So let me ask if it might be something else such as an atomizing system that used to promise increased mileage?

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 Ted, the way it is set up there, it has to be a made up PCV system. To be the devise you speak of, it would have to be under the carb some how. For a vintage motor there really is no need for a PCV but it may make some folks feel better about releasing some what less smog in the air. The way we drive our oldies, it makes no freaking difference to the planet. Cheers. George