A.I.R. plugs?

[oxide80]

What's the thread for the Smog ports on the 307 7A heads? AIR system was 1/2 missing and the right bank tubed damaged so I took them all off. Lines are temporarily pinched until I can get the proper plugs.

 

[lilbowtie]

My 229 had some weird tread plugs - I drilled and tapped the plugs for a 1/8th in pipe plug

 

[lilbowtie]

They are blurry but came across a pic of the plug .

 

[TURNA]

I thought they were 3/8 but looks like they are 1/2-20
You can get the brass pipe plugs at Home Dopey
The threads are a little off but the brass will cut into them just fine.
You can put some of the reddish orange permatex on the threads as a just in case.
It's not like you will be removing them.

You could also remove the tubes cut them take off the fitting and braise them closed or JB weld them closed and put them back in.

I think the HELP section in the parts store use to sell them.

http://www.classicindustries.com/product/1979/camaro/parts/emp330.html

or

http://www.rickscamaros.com/camaro-exhaust-manifold-smog-fitting-plug-set-1967-1981.html