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Engine question: What are these holes for?

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Old 09-28-02, 09:05 PM
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Engine question: What are these holes for?
I got the pic from the "pulled my engine" thread a few threads down.



What are they?
What do they do?
How do they work?
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Old 09-28-02, 10:09 PM
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Coolant
^^
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Old 09-28-02, 10:10 PM
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And Exhaust Gas
^^ bottom ones
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Old 09-28-02, 10:25 PM
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Those two little holes under each exhaust port do the same job as the exhaust port?
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Old 09-29-02, 10:11 AM
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Originally posted by JONSKI
Those two little holes under each exhaust port do the same job as the exhaust port?
If you use the stock exhast gasket, there is a hole in it for one of those holes under the exhaust port but I am not sure if that matches up with anything on a stock exhast manifold.

Certainly, both those holes get covered up if you use an "aftermarket" gasket and manifold.

I don't know what they are for.
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Old 09-29-02, 10:14 AM
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That engine looks familiar....
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Old 09-29-02, 10:26 AM
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That engine looks really good, too.
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Old 09-29-02, 10:50 AM
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Depending on what model year/car/gaskets you are using those will allow air to be injected into the exhaust port by the ACV. The middle hole also functions with the EGR system I believe. They're all worthless from a performance standpoint

Brian
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