1966 Worthington with a V2 Worthington 4 head 8 cylinder compressor. Converted from water cooled to air cooled 20 years ago. Still runs like a champ. Had leak issues and I found a couple but then the one in a place I have never seen. I will post pics when I am done with it in a day or so. Anyhow the leak, on the side of the compressor there is a large plate with 10 or 12 5/8" bolts in it and it has the oil sight glass and then a few weirdly placed bolts. I got the nitro up to 200 psig and when going over it with soap I noticed an oil vapor coming out of an allen head "plug", only the allen head had a hole in it. I was just about to plug this hole with a new "plug" when I noticed that this hole seemed a little too perfect. I called the local compressor re builder and much to my surprise this was and atmosphere port for the capacity control module inside and that it contains a bellows that will wear out over time and leak. Even more surprised they had one in stock (pricey little thing). I again will post pics of all of this when I am done.