Oil in exhaust crossover. Help needed

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Swede123

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Hi, new here and need some help. I have a 68 383.

I have had some problems with oil being pushed through breather cap. Today i pulled the torker intake and found oil pooled up in the exhaust crossover ports, a lot more on the driver side bank but some in the passenger side as well.Does anyone know what could be causing this?

Grateful for help, new on working on American cars and being in Sweden there is little help to be had. Thank you

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Thats carbon. Looks normal. That intake manifold if i am not mistaken,does not have a passage for the exhaust gases to pass through.
Do you have a pcv valve in the other valve cover?
breather on one side,pcv on other. Needs to be connected to vaccuum port on carb.
 
Tooljunkie said:
Thats carbon. Looks normal. That intake manifold if i am not mistaken,does not have a passage for the exhaust gases to pass through.
Do you have a pcv valve in the other valve cover?
breather on one side,pcv on other. Needs to be connected to vaccuum port on carb.
Click to expand...
Tooljunkie said:
Thats carbon. Looks normal. That intake manifold if i am not mistaken,does not have a passage for the exhaust gases to pass through.
Do you have a pcv valve in the other valve cover?
breather on one side,pcv on other. Needs to be connected to vaccuum port on carb.
Click to expand...

It’s hard to see on the pictures but there is a pool of oil in the horseshoe shaped port, the intake does have the passage but it was blocked by the valleypan. Yes there is a pcv on the other side but it was connected to the to the air cleaner.
 
Swede123 said:
It’s hard to see on the pictures but there is a pool of oil in the horseshoe shaped port, the intake does have the passage but it was blocked by the valleypan. Yes there is a pcv on the other side but it was connected to the to the air cleaner.
Click to expand...
That would be from pressure buildup,the horseshoe is an air gap for the exhaust passage. i think that will go away once you connect pcv to a proper vacuum port.
 
Tooljunkie said:
That would be from pressure buildup,the horseshoe is an air gap for the exhaust passage. i think that will go away once you connect pcv to a proper vacuum port.
Click to expand...

Okey, so nothing to worry about? Just new valleypan, intake gaskets and connect pcv to vaccum on carb. Thanks alot
 
That's probably come from leaking valve cover gaskets over time as those areas are heat sinks for the exhaust cross over, not the exhaust cross over itself.
 
The easy answer is the intake is not sealing very well so it's pushing oil everywhere. That being said - it should not be pushing oil. So the "real problem" is ring seal. Might be able to do a quick re-ring deal to fix that, or pull it and go full rebuild. Either way the oil is a problem, but it's only a symptom of the REAL problem. If the intake does get sealed, the engine will just push it out somewhere else.
 
An oil leak from the valve cover area above should be easily seen as it's not covered there. Possibly bolt hole seepage.

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But I'm thinking it's from the under the valley pan and above the head gasket area that just sort of flops around. Seems like a perfect place to hold oil.

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I noticed I had some seepage there when I took the six pack off recently.....

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It's a 383
oil in the horseshoe almost HAS to be coming from the valve covers.
And the likely culprit is build-up of CC pressure, due to the improperly plumbed PCV System.
The PCV HAS to be plumbed to the PCV port on the front of the carb where it exits UNDERneath the primary blades into a a hi-vacuum area.
The breather on the other cover does not need to go to the air box, but if you don't plumb it there, it will puke vapors onto the VC at WOT, when the CC pressure builds up. Or you can install a breather with a big nipple on it and redirect those vapors.
In any case, if you do NOT route that breather to filtered air in the airbox, you will have to wash it out periodically as it does fill up with dirt and dust.
 
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