I have a modified '87 GN. The car has a set of ATR cast heads on it, the EGR has been filled in on these heads. The engine has leaked from day 1 since it was built and I just now found it. I though it was valve cover gaskets, but, after installing 3 sets to no avail, I had to look elsewhere. The area around the EGR is always oily, so, I decided to remove the valve. I found the lower EGR port to be full of oil. Any idea of how this could happen?? Thanks!!