I believe Carl is correct. I have an engine that was in a 1946 and it has the oil fill at the top of the breather tube. I don't recall if that had an oil fill on the valve cover or not, but could check that.

[on edit] The valve cover on that engine had an oil fill cap - probably swapped out for a later valve cover.
Here's a pic of the breather tube with the oil fill cap.
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IMG_8275.JPG (329 KB, 150 downloads)

Last edited by klhansen; 10/03/2025 3:07 AM. Reason: added more info & picture
Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.