Well, I was cleaning up the manifolds today and I broke the tube that goes out from the top of the exhaust manifold and goes through to the bottom. Connects to the carb.

I seem to be having trouble finding info on what this tube is, what it does and what it's supposed to look like. Best I can find is on page 15 of the fuel & exhaust service manual.

What is it what does it do, where's it supposed to go to/from and how do I replace it?

Not drilling the stud, the stud fell out. I am drilling the block to accept the Heli-Coil.

So I got the Manifold off today.
I soaked them all in PB Blaster last night and then again this morning. I was surprised how easy the nuts came off. (Yes they DO have washer, by the way) However, I had to take most of them off with a the box-end of my combo wrenches; there just isn't room for a socket wrench -or- an universal joint (At least with my limited tools.)

Just when I thought I saw the weirdest of the weird, here's a new one.... I got the manifold off and sitting in one of the intake ports is a split washer! Just sitting there all nice and shiny from being washed with gas all those years I guess. I saw that and about had a heart attack. If that had made it's way in...... After setting the washer on the bench I noticed it's exactly the same as the ones under the nuts that hold the throttle to the manifold. And one of those was all new and shiny unlike the other three!

After a lot of research and Seeing what's there, I've opted to do a Heli-Coil. I picked up a kit at Autozone, but need to get a 25/64 bit to open the hole up.

Any Advice/tips on drilling straight?

BTW, I found this great article on manifold studs I thought I would Share. Link

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Well, minus all the "new and purdy."

Speaking of which. What paint did you use on the manifold?
I've thought about doing that while I had it out.

Certainly not on mine. Mine's pretty much exactly what BigKev Has.

Locking Device? It's just a nut on a threaded stud.
Perhaps I'm missing the question.

PackardV8 Said:
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Actually it must be a full-bore hole. The coolant "glugged" out of the engine. I lost about 2.5 gallons on 35-45 seconds.
It's pretty comical in retrospect. "What the? What is that? Coolant? What Do I do? Quick put it back in!, Crap I'm not going to get it in time! Quick get the oil drain pan! Dang that's fillin' up fast! What else do I have around here?" Basically the next two hours were pushing the 300 out of he garage, and cleaning up the mess.

I Hit everything with PB Blaster and will take a closer look in the morning.

Another question. By opening up the hole is there any danger of hitting something else? Oil? I don't know how close together everything is in that area.

I'm guessing this has been this way for a long time.
The nut was barely on the stud, perhaps 2 turns, but rusted in place. And there was no washer. Looks like someone striped it out previously and then went in deeper to try and get good threads. Then they barely had enough to keep the bolt on.

This one is a first for me. Never taken an exaust manifold off before. I'm imagining lots of heat and penn. oil on the nuts..... And I'm kinda scared now as to what condition the other studs are in. What do I need to be aware of? The Packard service manual doesn't reaally cover 60 yr old manifolds......

If tap the block out for a larger stud, is there a trick on how to I keep metal fragments out of the water jacket?

So I'm noticing that along with carb problems the 300 is blowing up smoke by the exhaust manifold. It has had a slight ticking noise under load so I figure I'd check the bolts...
Upon visual inspection I notice one of the bolts (The one visible from under the bonnet right through the hole between the intake and exhaust manifolds) seems to be way out on the stud. Ok, I go behind the wheel with a long socket extension and give it a few turns. "Hey exhaust manifold bolts shouldn't turn this easy" Then bam! the whole thing pops out and I have all the coolant that was in the block now on the garage floor.

What the?!?

Someone please tell me I'm an idiot and everything will be ok.

What did I just do?