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Old 06-30-2007, 07:28 PM
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Oil in manifold plemun

I got a friend who is running a Chevy 383 with headers and World Product Aluminum Heads. He is getting an oil residue in the bottom of the manifold plemun. He pull the manifold and replaced the intake gaskets and had the valve seals checked at a machine shop and was told they are fine. Anyone got any ideas to why he would be getting oil in the bottom of the manifold?

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Old 06-30-2007, 08:17 PM
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does it have a real lopey idle ? maybe it's from valve overlap meaning that some exhuast coming into the intake runner this is what causes that lopey idle .

Last edited by 383silverado; 06-30-2007 at 08:26 PM.
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Old 06-30-2007, 08:38 PM
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If he has a tranny with a vacuum modulator (i.e., TH350), it could be a ruptured modulator diaphragm and tranny fluid and not engine oil.
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Old 06-30-2007, 10:08 PM
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is the pcv sucking oil?
Shane
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Old 06-30-2007, 10:43 PM
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If this is the same one that has multiple pages on the subject on another board I say its the intake gaskets leaking and/or he had the block decked and didn't get the manifold machined to the correct angles.

The reasoning behind this is:
First he had a plug fouling and the oil in the manifold, he then changed the intake gaskets and after this he had a different plug fouling along with the oil in the manifold.
He changes the gaskets and the plug that fouls changes......make sense?
If the block was decked and/or the heads shaved this changes the angles where the head and manifold meet and the manifold will need machined as well or he will fight the same problem for along time.
If this is the same one, he posted a pic of gaskets that were "sealed" they showed a large amount of silicone that squished out when things were tightened, this could be the problem as well...that much silicone should not be needed on an intake.

If this isn't the same as the other forum please delete this.
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Old 07-01-2007, 11:19 AM
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Good questions, again this is a friend who called me up. I will ask him to see about your suggestions. Thanks, and if anyone else has an idea, please let me know.
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Old 07-01-2007, 01:38 PM
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Quote:
Originally Posted by willys36@aol.com
If he has a tranny with a vacuum modulator (i.e., TH350), it could be a ruptured modulator diaphragm and tranny fluid and not engine oil.
Nope, he is running a 5speed tranny.
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