Dale, I'm not sure if this is the info for which you're looking, but just in case...
Oil comes up to the rocker shaft through a passage in the block, then goes through a short drilled stud, and then up through a passage in the bracket that supports the rocker arm shaft.
Here's an exploded view...
...where #22 is the drilled stud, identified in my book as "Stud, valve lever shaft oiler", and #18 is the part of the bracket that carries the oil to the shaft, identified as "Bracket, valve lever shaft, center".
Here's a picture of my "#22" stud, of which I took a picture when I rebuit my engine. What I cannot remember is whether the side hole in the stud has to be particularly 'oriented' when it's put back together so that the oil gets to where it's needed.
I only realized what it was when I discovered I had to replace mine because the threads were stripped.
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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