Help me answer an NB engine question for a guy on Miataforumz
 

The guy's got an oil leak on the back of the head and I don't know enough about the NB head to help much. Thanks iin advance for helping him out.

http://www.miataforumz.com/showthread.php?t=976

yeah that brass plug is actually not brass but there is an o-ring on it. remove the bolt holding the bar over it. and pop the plug out with a screwdriver replace and your good. or, if your in a pinch you can rtv it. i dont recommend this though as youll have to clean it up at some point.

If someone doesn't get to it first, I've got a spare head sitting on the bench at home. Just walked out to the parking lot here at the office and I can't see jack back there