I had a 68 Mustang with an 'air reactor system' that was pulled off my car
when I was in high school. The dealer actually 'bent over' and crimped the
air tubes. Eventually they leaked and made a racket.
Another dealer almost choked when I asked how to plug the holes telling
me 'that's illegal!'. Heck, I just wanted to stop a leak.
Eventually I pulled one of the 'pieces' off the manifold and got a plug from
a plumbing supply store that fit the size and threads and screwed them in.
Then when I had the manifold off I used a drill with a grinding ball to
grind off what was protruding into the exhaust.
If you go looking for something to plug the hole, DON'T let on what it's
for. Or if you do, say it's for a motor that was pulled from a car and
now runs a generator or something else.
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