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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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