Thanks for the report. Congratulations.
Forgive my rant, below, on "steam vented head"
Thanks and forgiven! I just started my 235 education, I haven't even heard the term until I started this thread. Based on your photos the hole in question on my head isn't even the misnamed steam vent holes. My head has the colant holes near the center of the cylinders but the ones around the spark plugs are the ones causing concern.
I think I probably misread Dave's post early on and imposed the name on the feature in question.