308 Cylinder Head Smog

Those are air injection tubes and if you no longer have any smog concern, you can remove those and plug the holes.

 

But best to use a "plug" with an end shape that fills the smaller hole (not just a flat ended M14 plug). Do a search on "108205" for prior threads:
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Do the search and read. Verell Boaen at Unobtanium Supply may be one source (but he has said he is backed up lately), or I've previously posted a drawing that you can take to a Machine Shop for fabrication.

 

Available at UnobtainiumSupply.com but he might be busy for a while.

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In addition to Steve's notes, if you are a DIY-sort of a guy, do a search under my user name in this specific forum for an old pictorial thread where I've documented making scribed-end plugs out of your old nozzles, for only the cost of a cheap bolt.

I like this concept as it allows the angled matching of the end of the plugs to the head's exhaust port walls for a divot-free end result.

Typical picture from my archives (details and more pics can be found at the above referenced old thread):

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If you are really handy and have a lathe you can make your own, this one is for the 2 v engine.
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I'm always pleased by the technical knowledge and sharing of information by FChat members. It helps to keep the vehicles surviving, while not draining the bank account too much.

 

I don't have a lathe but I do have a welder. I would remove the injection piece, cut the stem off close to the top, weld it shut, and put the piece back. I sure would not want to wait for Verell to catch up to his order.