IIRC (I may be thinking about BBM heads I did back in 2013) there is a bolt boss that hangs down into the port. I ground it out of there, but there was a bulge in the port where the oil feed gallery comes between the ports and I didn't screw with it much. My butt puckered with thoughts of a small fracture developing after 50 runs or something and filling the cylinder full of oil.
I know God hates a coward but that made me a bit queasy so I let it be!