 914-4 2.0 liter heads |
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| bcheney |
 Oct 30 2006, 09:05 AM
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#1
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Senior Member  Group: Members Posts: 1,341 Joined: 16-November 03 From: Orlando, FL Member No.: 1,348 Region Association: South East States  |
What are the two ports in the 2.0 heads just outboard of the top intake studs on each side? I have a dual carbed car and there are two plugged threaded stud/relief pieces currently installed into each of these points.
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Replies(1 - 3)
| ConeDodger |
Oct 30 2006, 09:18 AM
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#2
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Apex killer! Group: Members Posts: 23,606 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California 
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QUOTE(bcheney @ Oct 30 2006, 07:05 AM)  What are the two ports in the 2.0 heads just outboard of the top intake studs on each side? I have a dual carbed car and there are two plugged threaded stud/relief pieces currently installed into each of these points. Must be late heads. They are part of the emissions system. If you are not going back to the emissions system have them welded up. |
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| SLITS |
Oct 30 2006, 10:25 AM
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#3
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
They are air injection ports. That hole goes directly into the exhaust port for air to be injected into the exhaust stream via the smog pump.
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| jk76.914 |
Oct 30 2006, 01:03 PM
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#4
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Senior Member Group: Members Posts: 809 Joined: 12-April 05 From: Massachusetts Member No.: 3,925 Region Association: North East States |
These engine runs a bit rich. Injecting air (and the oxygen in it) causes the hydrocarbons to keep burning even as they are flung down the exhaust pipe.
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