'75 2.0L heads

[RustyWa]

My heads have the air injection holes. I've removed all the air tubing (non-functional) and am about to plug the holes in the heads using old 10mm valve adjuster screws and high temp thread sealant.

My question.

Do these air holes in the heads have some kind of a "shoulder" at the bottom of the hole where the screw can bottom out on?

I don't want to screw them in so far so that they are in the exhaust flow.

Thanks.

[Zeke]

I didn't see a shoulder on mine. However, I think that the thread is tapered like a pipe thread. It's my WAG that the adjusters will bind up when deep enough. I had mine welded up, so I didn't do the method you are about to. I have read where many have, though.

[mike95125]

Nope, and you can put it in farther than necessary if you are not carful. That atleast was my experience with my 76 2.0 heads. HTH

[mike mueller]

I just kept the stock air injectors and plugged those up using a ball bearing and a 1/4" endcap for plumbing....so far no problems...I'll snap a picture so that you can see what I did.

Mike

[Kenny Powell]

mine were sent out to be done but it looks like a copper plug of some type that's in just about flush, don't know the length of thread? these were true 75' 2.0 heads.

[RustyWa]

Hmmm, not good. Maybe I can use some kind of depth gauge made out of a bent paper clip or something so I don't go in to deep.

I think I have read somewhere where someone used bolts, of the correct length, but I can't imagine the bolt head having enough room once the intake is on.

I would really like to get all the old injector stuff out to clean it up in there.

[mike mueller]

I have bolts on one of my 2.0 motors....the head just barely clears the gasket on the motor.

I had one of them back out so I made little brackets that slipped over the stud for the intake tubes and prevents them from popping out.

I used hex head bolts, so socket cap bolts would give you plenty of clearance.

I think this is a better idea than screwing something down in the hole which you cannot see. I have heard of the adjusters working themselves loose.

[RustyWa]

Ok, so here's another question if I go the socket cap bolt path. I'm liking that idea, because then I can keep an eye on them and they can only work there way out.

Do the existing air injectors actually stick into the exhaust port (stream)?

I can't imagine the injector sticking into the exhaust stream. If it does, I'll look for a bolt slightly shorter. I'll use the old injector to get the correct length.

[Kevin Powers]

my engine came with those ports hooked up to a breather box. cleaned, new hoses and clamps.

kevin

[Dave at Pelican Parts]

Uh, Kevin--I don't think those are the air injection ports. I think those are the PCV ports; not the same thing.

The air injection ports go into all four exhaust ports. The PCV port (only one per head) goes into the rocker box.

--DD

[mike mueller]

As promised, here are a few pictures:
First one is the bolt with a bracket to prevent it from backing out.
The rest of the photos show my current motor with the injectors plugged up. I did not want to remove the air injectors since the motor is not mine and the motor will be in my car just for a few months.

[Kenny Powell]

Eric, check with some head rebuilder's there are far better ways or Idea's than these example's, the socket ball bearing example is decent, to each his own.

[mike mueller]

I'm sure there are plently of better ways to do it....mine only cost 6 bucks or so and it reversable which is why i like it.

Mike

[Kenny Powell]

Mike, or anybody would locktite work on that first example?

[Mark Henry]

Locktite on a hot head? it's not going to last very long. Heating is how I remove #620 sleeve fit locktite.

[Scott S]

Originally posted by mike mueller
I just kept the stock air injectors and plugged those up using a ball bearing and a 1/4" endcap for plumbing....so far no problems...I'll snap a picture so that you can see what I did.

Mike

I did exactly the same thing with no problems - and that is since 1996 and 7000 miles ago...

[Kenny Powell]

Originally posted by Mark Henry
Locktite on a hot head? it's not going to last very long. Heating is how I remove #620 sleeve fit locktite.

Why is loctite reccomended for intake to muff pipe bolts when they back off, they get just as hot?