Hi all. I'm new to the forum, and new to working on old tractors. I just picked up a 1955 Allis Chalmers CA. The motor was froze, so I had to remove the head. There is a part in there that is not listed in either of the service manuals I have. It looks like some sort of oil catch basin. It sits under the rocker arms against the top of the head and runs the length of the head. It has only one hole in the rear lowest part where it looks like oil would return through. I attached a picture of it. Can anyone tell me what this is and why its needed? Since its not in any manuals that I've found, I'm tempted to just leave it out.
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