are these air injection tubes?

I found these things in a box of a few parts my machine shop returned to me after doing a magnuflux, hot tank and valve job on my head. I'm not sure what they are. There are four of them. Looking through the Moss catalog, they look like a part called "air injection tubes" with further confirmation being that Moss says four are needed. Is that what these are? Where do they go? Perhaps they are supposed to be inserted into the holes in the head by the spark plugs that the air injection manifold screws into. Neither Haynes nor the Bentley manual mention these things when talking about the air rail manifold, so I'm not sure.

So it may be some emissions stuff. This is a 1977, registered in CA so subject to emissions. Lots of the emissions system has been modified, so a little hard to match up what I have against what is documented in any manual.

Now that I'm nearly done with my engine rebuild (going on eight months...) I'm at the proverbial issue of "I've got everything put back together but have four sparts that I never installed and don't know where they go. Hmm..."

looks like them.

in the cylinder head. unless you're running an air pump leave em out.

Yeah, they shouldn't of took them out.

they direct air in the correct place when running an air pump. i agree that they should'nt have been taken out. they're pressed in the hole from the outside where the air rails screw in. i'd put them back in if you use use your air pump, leave em out if you're not. when installed they should stick out about a quarter of an inch in the port side of the head.

The air injector system adds air to the exhaust - right after the exhaust valve - in the hope that any remaining unburned hydrocarbons will finish combusting.

If they are not there, then the air doesn't really get properly inserted into the exhaust flow and I doubt that they will help your emissions much. So, if you use the air pump, put them back in.

If you do not use the air pump, then they should not be reinserted because they impeded the exhaust flow (a little bit).

I am of the opinion that the machine shop did correctly in removing them. They cannot be removed with the head on the car (or even with the valves in the head), but they can be reinserted with the head in place. So, if you were using the air pump it is easy for you to put them back. If you were not, then you don't have to remove the exhaust valves and fool around with a pin punch trying to drive them back out. They made the choice that would be right for either situation.

Have you determined if your air-pump is working? That would be part of the situation in passing the inspection.

Maybe someone with CA emissions experience will chime-in.

Here is a picture of the air injection pipe in the valve seat area of the cylinder head.