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914World.com _ 914World Garage _ 914-4 2.0 liter heads
Posted by: bcheney Oct 30 2006, 09:05 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.
Posted by: Rotten Robby Oct 30 2006, 09:18 AM
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.
Posted by: SLITS Oct 30 2006, 10:25 AM
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.
Posted by: jk76.914 Oct 30 2006, 01:03 PM
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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