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The Incredible Shrinking Manifold???
https://www.slantsix.org/forum/viewtopic.php?t=5826		 Page 1 of 1
Author:  '74 Sport [ Thu May 22, 2003 11:53 pm ]
Post subject:  The Incredible Shrinking Manifold???
Folks, learn this from my mistake. Check parts for fit as soon as you get them. Otherwise, you may waste a lot of precious time.

The 225 /6 in my son's 1974 Dart Sport originally had a 1 bbl carb. We had the bright idea of going with a 2 bbl Super Six. Simple enough.

1st step:
We scavenged the Super Six intake and exhaust from a 1978 Volare, later to find out that the intake was fairly rusty inside and the exhaust was cracked severely (after I sand blasted it thoroughly). :(

2nd step:
We took them back to the salvage yard and swapped them for a 2 bbl set-up from a 1976 Volare station wagon (nice guy at the yard, huh?). Notice, I didn't say a "Super Six" from the wagon, because the air cleaner cover did not have a decal on it. Does it still qualify as a Super Six? I had the intake and exhaust both vatted and runners ground flat for a good seal at the head. Then I sand blasted the exhaust and painted it with High Temp. Cast Iron . Looks great! :D

Remember a few days ago when I asked if all manifold gaskets were made the same for slant sixes? It seemed like the Fel-pro gasket in my rebuild kit was a little too long. Guess what, it fits on the head. I tried it tonight, and it slipped right on every stud. :? So, what's the problem, you ask? The exhaust manifold doesn't fit!! It's about a half bolt diameter too short. :evil:

3rd step:
I guess now we'll have to clean up and sand blast (3rd time) and paint the original exhaust manifold. This time I'm going to check the Super Six intake to make sure it will mate up to the old manifold, before I get too carried away.

Here's a question:
Why won't the manifold, which came off a slant six, fit on my slant six? I can't tell you how frustrating this has been. I didn't want to use the old manifold, because the heat control valve wasn't working. Oh well, I took the "flapper" out and will do without it. Aaron and I are getting plenty of practice removing manifolds.

Anyone need a freshly blasted and painted exhaust manifold? :shock:

Jerry
Author:  Pierre [ Fri May 23, 2003 3:23 am ]
Post subject: 
You know I went through the same thing, I got an exhaust manifold from the junkyard (can't remember off of what...) brought it home and it wouldnt fit on the head. I never found out why. I hope someone here can solve the mystery!
Author:  slantvaliant [ Fri May 23, 2003 12:03 pm ]
Post subject: 
Y'all are scaring me! :shock:
I have a Super Six setup in my garage, waiting for a good long weekend, and now I have to wonder if it will fit? I thought converting the pedal and throttle linkage would be enough of a headache ...
Author:  Doc [ Fri May 23, 2003 12:45 pm ]
Post subject: 
The SL6 exhaust manifold is known for warping problems so use the gasket as a guide to see how straight the unit is.

If you are looking for manifolds at the wrecking yard, always look at the end mounting studs, if both the front and rear studs are there, with the correct hardware then chances are good the the manifold will swap onto another head with little trouble.

If end studs are missing, there is a good chance that the manifold is warped, you can confirm this by looking into the hole where the stud should be, most of the time the manifold has drifted over the place where the broken stud end is located.

As a manifold "bows" it becomes shorter, end hole to end hole.
DD
Author:  '74 Sport [ Fri May 23, 2003 1:29 pm ]
Post subject: 
You should have seen me last night when I discovered the problem.
Probably looked like this :shock: . You could have knocked me over with a feather.

There's no telling how many slant six exhaust swaps are talked about on this board all the time. I have to get the one that won't fit. :evil:

By your silence, slanters, you must be stumped like I am. I need some help here, this is my first rodeo with all this "slant stuff".

I'll leave you with what may be two clues, before I have a chance this weekend to test my uneducated suspicions at the salvage yard where I got this stuff:

1. The rear manifold stud was missing.
2. The air cleaner cover did not have the "SUPER SIX" decal.
3. I have a '74 225 ci /6, the manifolds came from a '76 Volare (engine displacement now in question).


How about this? Is the 170 or 198 block slightly shorter in length than the 225? If so, what if the past owner discovered they had a cracked exhaust manifold and had it replaced? What if they couldn't find one for a 225, but did find one on a 170 or 198? See where I'm going with this? Take out the back stud, bolt it up as best it will, and let 'er rip.

Unless I hear something different from some of you, I'm going back to the boneyard and get more info. on that Volare. It may not have had a 2 bbl in it originally. It may be a Frankenstein of various parts.
Author:  killin5 [ Fri May 23, 2003 1:39 pm ]
Post subject: 
Don't feel bad. I have 4 exhaust manifolds sitting in my garage. Each didn't make it on to my car for one reason or another.

The one on there now is the one I paid the most for. I just had to justify spending the money.

John
Author:  slantvaliant [ Fri May 23, 2003 1:51 pm ]
Post subject: 
Hmmmmm ... This might be a good excuse to install Dutra duals ... :wink:
"But Honey, the old one won't fit. I HAD to buy the duals!"
Author:  Doc [ Fri May 23, 2003 3:02 pm ]
Post subject: 
All SL6 heads are the same, all the mounting stud "bolt patterns" are the same, 170, 198, 225....from a bolt pattern / mounting stand point, all use the same head and manifolds.

You just ended-up with a badly warped, used exhaust manifold, a pretty common problem for us Slant Sixers.

Truth is that this is the reason I built a casting pattern and started making the "Dutra Duals" split exhaust manifold system. I was "fed-up with years of this kind of trouble.
Once the exhaust manifold is in two sections, many these issues / problems go away.
DD
Author:  '74 Sport [ Fri May 23, 2003 3:08 pm ]
Post subject: 
Hey Doc,
Would the 2 bbl. intake and Carter BBD on the Volare I scavenged from qualify it as being a "SUPER SIX", even though the air cleaner cover had no decal?
Author:  Doc [ Fri May 23, 2003 3:46 pm ]
Post subject: 
Yes, a 2 BBL SL6 in a car / truck / van is a "Super Six". (if it is in a boat, it is the "Marine 2 BBL")
DD
Author:  Bob D [ Fri May 23, 2003 6:57 pm ]
Post subject: 
This is not directly related to your problem, but I'm pretty sure that the '76 Volare didn't have a 2-bbl manifold. I don't believe they started using them until '77. If you found one on a '76 perhaps it had been converted.
Bob D
Author:  '74 Sport [ Fri May 23, 2003 10:14 pm ]
Post subject: 
Bob,
That's one of the things I'm going to check out this weekend. Won't take but a minute to check the fender tag.
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