Oil should be coming from the top center of the rockers where the two halves meet. Also, some will drip from the rocker bushings. If you aren't seeing oil along several of the rockers, the tube is probably full of sludge or the center cam bearing has spun in the block. The ends of the rocker tube are expansion plugs. They can be removed so you can clean out the tube and make sure all the oil holes are open. Remove it from the head before cleaning and remember which way the rocker arms go. It is very important.
The small horizontal tube is part of the crankcase ventilation system and isn't under pressure.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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