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Hole in intake?

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Old Sep 15, 2012 | 09:21 AM
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455man
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From: Wichita, Ks
Hole in intake?
Does anyone know why there is a hole in the back of this '72 350 intake manifold? It seems like it would leak oil?
It looks like a factory or well cut hole.
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Old Sep 15, 2012 | 09:54 AM
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Originally Posted by 455man
Does anyone know why there is a hole in the back of this '72 350 intake manifold? It seems like it would leak oil?
It looks like a factory or well cut hole.
That's not a factory hole. I'll guess that a previous owner wanted to run valve covers without breathers and used this hole for a PVC valve or breather of some kind.
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Old Sep 15, 2012 | 11:33 AM
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Agreed. Not a bad place for a pcv grommet. Some Cadillac V8's use this location. Seal it or use it for that, or get another intman.
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Old Sep 16, 2012 | 02:38 PM
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455man
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Cool. Thanks guys. I think I'll seal it. Not a lot of pressure in this area right?
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Old Sep 16, 2012 | 03:33 PM
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slight negative pressure if your PCV is working correctly...
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