Case noticed that there are 2 bolts missing directly in the center of the upper plenum. Apparently Sofie never had them as there weren't any leftover bolts that would have fit. Does anyone know what size they are, or where I could get replacements?

 

Go to a pick n pull junk yard and pocket a few?

 

ya go to eichelbergers u pull it in stoverstown on sunny side rd there are a few newer f bodys in there or there were ne way

 

I think there is one on each side that is round and has a torx looking cut in it. I will look in the garage in a minute to see if I can figure out for sure which one you are referring to. If I remember correctly, there are 2 bolts, one on each side, on the passenger side, I believe it holds the mount for the atl and vac hoses and stuff. On the drivers side, I think it is just screwed in.

Well shoot! I'm SOL. Got 2 sitting in the drive and the kids are gone with the keys! I was going to scrap the snow off the hood and try to look at the engine to see what they have.

 

According to the parts manual in the sticky, in the pic on page 29, item number 551, it is showing there should be 8 of them for the UIM, all the same. They are M6x1x36

 

ok, im aware of those 8. i know of the two torx that hold the map sensor in on the passenger side. however, there are two openings on the driver side of the upper, going down towards the passenger side on the upper, and a matching machined and threaded part on the lower. her hayne's manual covers nothing on plenum removal. im going to try fastenal or low to get some bolts as i wont get to a junkyard in a few weeks

 

Ok, I am looking at some pics I took when we did the head gaskets and I am seeing 2 holes in the LIM and UIM that are lined up with the number 2 and 4 cylinders about center of the manifolds but our UIM does not have holes on the outside for anything to screw into those internal holes that I can see. Are those the holes you are talking about and they come all the way through to the outside of your UIM?

 

that sounds like the holes. let me see if theres any pics i can share

theres the 3 on the perimeter, but two in the center. they line up with the machined bosses located on the ports to cylinders 2 and 4 on the lower intake, and they are tapped, but not sure what thread pitch

 

It is number 12 and 13 in the torque sequence. We do have those hole, covered up in pic by fuel rail. Let me see if I can find one of those bolts from the old engine we removed.

 

I have an upper sitting here and there are indeed two holes that exit the upper right on the side of the plenum. They're hard to see and I would guess impossible to see while still on the car.