How about the pcv oil seperator thats between the heads, I had the same thing and that was my leak. you cant get that out all the way though with out removing one of the heads, I am not really sure about that but Terry Haines told me that so I just removed the uim and lim and it is held in place by two bolts. if you unbolt it you can rotate it upside down and remove the gasket, clean it and install a new gasket then just reverse to install.
