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Are you talking about the rectangular slot to the left of the bottom bolt?

That's not an opening. It's a casting indentation. It's not your leak source. Get a mirror and look at it. You'll see what I'm talking about.

Make sure you replaced both the filter gasket and the upper gasket on your solenoid. Clean the surfaces before you reinstall.

Here's a picture for reference

 

ok... looks like OP deleted posts while I was answering.

 

Thanks for the reply! I replaced the solenoid and cleaned the area. the oil was leaking out of that Port looking part of the cylinder head casting. I found another thread on B20vtec that covered this issue where others had found the head casting cracked in that area. Anyway, I used high temp Quick steel metal epoxy and so far so good !