exhaust manifold questions

[lorwood]

I am replacing the C3 exhaust manifold on my 200 that I suspect is leaking with a repro C8 Manifold that I purchased from CJ Pony Parts. The new manifold has a 5/8" threaded hole just to the rear of the "stovepipe" hole on the topside of the manifold. My current setup of an 1100 carb does not seem to require this extra port. What is the purpose of this 5/8" threaded hole? Can I just plug it with a male fitting?

Any tricks to getting at that last bolt by the starter? Do I have to remove the starter moter to get at this bolt? All bolts have been soaked in penetrating oil and will come out with ease. Thanks Guys

66 Mustang 200 cid

 

[mysavioreigns]

I removed it - I found that it took me more time trying to get it out with the starter in there, than if I had just removed the starter....it's not difficult to get it off and put it back, either.


...

Actually, I just re-read what you wrote: Do you mean the bolt on the top of the manifold, or the one underneath? For the one underneath, you need to remove the starter, but the one on top, you should be able to get off w/o it.

 

[fordconvert]

The manifold with the 5/8 hole is for a EGR car.

 

[shmoozo]

The manifold with the 5/8 hole is for a EGR car.

Which means that on a car without EGR a person could just block the hole with a plug, right?

On the other hand, maybe it could be used (with an adapter bung of some sort, perhaps) to mount a wideband oxygen sensor to check the air/fuel ratio in the engine if you're installing performance enhancing upgrades. This could be helpful when tuning that carb for performance and fuel economy.

 

[woodbutcher]

Hi shmoozo,I think from what I have read on these forums,that the sensor should be mounted at least 2 feet down stream from the exhaust manifold to prevent it being heat damaged.
Leo

 

[x21]

Have a D8 manifold myself, also with the egr hole- I just plugged it up. At first had to use an old sparkplug, until i made it to the parts store to get a real plug.

 

[shmoozo]

Hi shmoozo,I think from what I have read on these forums,that the sensor should be mounted at least 2 feet down stream from the exhaust manifold to prevent it being heat damaged.
Leo

So just move the exhaust manifold a few feet ... um ... Oh, wait ... there's a problem with this idea, isn't there?

 

[woodbutcher]

Actually,there`s no problem.Weld a bung in the exhaust pipe to mount your sensor.Easy.
Leo

 

[lorwood]

Installed the manifold this weekend. Pluged the egr hole with a 3/8" male plug. Only other problem was a slight mod to the throttle linkage. It was hitting a buldge in the manifold that was not on the original. The improvment in performance was quite noticable. Of course after a few test trips the car would not start. Sounds like a dead battery! But the battery is only one year old and the ammeter shows that I am charging while driving. Battery is on the charger now. The entire charging system including the wiring harness is new. So I don't quite know what gives

 

[wallaka]

Just make extra, extra sure that your connections are clean, from the battery to the solenoid and from the solenoid to the starter. Also make sure that the ground wires are good and have a clean connection.

A Chevy will chug over with a bad connection, but a Ford will just click.