Those are cork and they are original from factory that way. Problem is after all these years if you need those holes good chance the cork actually hurt rather than helped preserve the threads. At least on the ones I had. After removing the cork the threads were really rusty and have to retap them but the threads were not as nice as I'd like them to be. What I do on my tractors is to stick short bolts with never-seize in the holes to keep stuff out of them.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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