A few months ago, a got a '50 Desoto Custom, and I've been a lurker here since, looking up info and finding answers to common questions. I've got one I haven't found an answer for. My head has a "feature" I've not seen before, a hole In the #6 combustion chamber which goes into the water jacket. It lines up with a pipe plug, which I've removed. You can see daylight through the hole. Seems to me, water would pour into the cylinder. Is there supposed to be something there?