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Intake Manifold Question

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Old Mar 30, 2005 | 10:32 AM
  #1  
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Default Intake Manifold Question

I just put a non-EGR Performer Intake on my '77. There is a manifold port under the water neck on the front driver's side. What is it for?
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Old Mar 30, 2005 | 11:15 AM
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If it's a threaded opening. It's probly for a ported/thermo vacuum switch. Emission junk. Or does it go through to the coolant passage under the thermostat opening? Could be for a coolant bypass hose. Can you post a pic of it?
Darryl

Last edited by Sarge81; Mar 30, 2005 at 11:17 AM.
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Old Mar 30, 2005 | 11:23 AM
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Thank you for the reply...

I can't post a pic right now...It is a threaded port and I do belive that it connects to the water passage. The heater hose is on the passenger side of the manifold, so it is not that. If it is a water port, what would it be for? If I don't need it, what should I use to plug it?

Any help would be great!

Thanks,
Chris
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Old Mar 30, 2005 | 11:49 AM
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I agree with Sarge on this one... I think it's a thermal switch for the emissions stuff...
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Old Mar 30, 2005 | 12:44 PM
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If it's about 3/4" then just run in a pipe plug. Or you can use it to relocate your water temp sending unit.
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Old Mar 30, 2005 | 01:35 PM
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Waterpump bypass.

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Old Mar 30, 2005 | 04:51 PM
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I just put a pipe thread plug in mine.
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Old Mar 30, 2005 | 05:27 PM
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Originally Posted by fast idle
I just put a pipe thread plug in mine.
I put my temp sender in it since the threaded hole in the new head was too small.
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