smog tube removal heads

O.K. as if I already dont have enough threads posted heres one more. I am not sure if this is where my smog tubes were at one time or not. But I have talked to a couple people on this valvetrain noise and they asked if I had a smog pump no I do not. They asked if where the tube was if its still open or blocked off I said I dont know. So I go and look and there is a bolt sticking out of each head on the back side of them towards the firewall. The one on the passenger side was snugged I put another 1/2 turn on it and it feels like it could go some more but I dont want to strip it. The one on the drvs side was lose. I was able to tighten it up some with my hand. The bolts took a 5/8 nwrench to tighten. Are these where the smog tubes went and if so how tight do they need to be. Should I take them out and put thrtead sealent on them or anything. Will they give you valvetrain noise if they are not supertight?

O.K. well I can feel 3 things on the back of the heads one of them is a recessed cap (freeze plug) The other one is the bolt that doesn't look like your everyday bolt and a empty hole thhat a 7/16 bolt would go into for like a lifting point thats it.

O.K. when I bought this car back in November these bolts were already in both heads. If you are standing on either side of the vehicle looking in the bolt is located on the back closest corner of the head to you. I just got my heads and motor back from the machine shop I suspect thats how the 2 bolts on there got lose. I dont know. I just know that when I put my motor back in I used the one empty 7/16 hole on the head to lift it and it was a 1 inch bolt and it wouldn't even thread all the way into the head.