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Found this out while swapping from a low to high port head and didn't know there was a difference in the fitting. And this is due to the intake manifold clearance issue. So here are the different fitting. Hope some needs this info... I learned the hard way.
![](http://i67.photobucket.com/albums/h284/Sentrixx/1999%20Nissan%20Sentra%20Se-L/ISSUES/IMG00254-2.jpg)