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you can also plug the air injection holes by taping the holes with 1/4" 20 and put a set screw or bolt and cut off the head in the hole.


Clean the holes well and fill and level JB weld. Done it may times and never had one fail yet.




I had one start leaking on a set that I did with jb. So For that exhaust port, I took a very slightly tapered pin that barely fit one end in the hole and tamped it in with ball-peen hammer. (Ace Hardware) worked like charm