I'm getting ready to take the smog pump off my engine, and am having problems finding a plug for the hole in the exhaust manifold.

I measured it to be around 7/8 or 22mm. Does anyone know of the correct size and thread count? Or where to get one?

 

you probably won't find a plug thats exactly the correct size, i know i couldn't ,

i got some brass pipe plugs, but don't remember the size, i used the brass, cuz it seems softer than steel so the threads would adjust for the slightly different threads and seal up well

 

Do you remember what size/pitch you bought?

I assume it doesnt leak either?

 

Found something! 5/8 flare fitting! Appears to be it. Like 3 bux from hardwear store. Will have to cut the "flare" part off, but nothing the air tools wont fix in a few minutes.