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Posted by: LvSteveH Aug 9 2003, 04:31 PM

I just picked up an extra 2.0L head cheap, and now I know that you get what you pay for. I can't for the life of me figure out why, but there is a port drilled on each side of the intake studs, as indicated by the arrow in the pic, and the hole extends all the way down into the exhast port, just behind the valve. It appears to be tapped with threads on the end in the port. Could it be for an air/fuel mixture sensor for each cylinder? How bout the world's smallest quad turbos.

Thanks for your help.


Attached image(s)

Posted by: Jeff Bowlsby Aug 9 2003, 04:45 PM

Those look like the 75-76 GC code 2.0L heads...

with air injection ports. They can be plugged and ignored.

Posted by: Bleyseng Aug 9 2003, 04:48 PM

Those are the super rare heads for the NOS injection option! Way cool!!

Posted by: redshift Aug 9 2003, 05:00 PM

Those are the blow-by relief valves, you don't want all that oil that got around your rings leaking out around the gaskets!!

It also solved the problem with clean engine compartments on early cars.



M

Posted by: seanery Aug 9 2003, 05:17 PM

There is an active thread, a guy is looking for a set of those.

Posted by: LvSteveH Aug 9 2003, 06:20 PM

I didn't even think of air injection, I just assumed Porsche was smarter than that. I got this head and a 1.7L head for $100. It's always good to have parts. Unfortunately I don't have the other side. I appreciate all the input. I can imagine the surprise if someone put this on a car and didn't notice the ports, which would be easy to do. It would sound like a harley.

Posted by: McMark Aug 9 2003, 06:34 PM

Just so we're clear, isn't this the not-so-interesting Bus 2.0 head and not the quite-intereting 914 2.0 head which makes big power?

Posted by: LvSteveH Aug 9 2003, 07:30 PM

To the best of my knowledge a bus 2.0L head is still the 1.7/1.8L head we all know and love, with four intake studs and standard valves. The 914 2.0L heads have the sodium exhaust valves (which this head has) and three intake studs.

Posted by: cgnj Aug 9 2003, 07:34 PM

Correct, I have a set on the shelf. I can pull them down and do a direct comparison with a 73 2.0 head. Any interest?

Carlos

Posted by: LvSteveH Aug 9 2003, 08:23 PM

I have a couple sets of 2.0L heads, I just picked this one up as a spare in case I ever need one. I suppose it would be better to plug the hole than to weld it up in the event that it needs to be used on an original car that still has air injection. Is anyone else addicted to collecting 914 parts? It's getting ridiculous.