282 head unknown hole size

Posted by Jerry On 2021/1/31 13:32:58
Trying to finish up the chassis and engine on my 42 with a 282 cu inch engine.
I bought a 3/8” NTP brass pipe plug to put in the side of the head on the left rear side. It is just a little to big to thread in.
Any idea what size is supposed to go in there and secondly what the hole is used for. I have heads with and without this hole.I search all my books and pictures but could not find anything.
Any ideas?
Thanks again, Jerry

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