Posted by Doc Dave on Saturday, July 16, 2005 at 8:50AM :
In Reply to: Car head? posted by chriscase on Friday, July 15, 2005 at 10:44PM :
This engine was original from a 53 FFPW. I think you may be right that it may be a short bolt that goes in there, perhaps it is to bleed the coolant. It looks to be coarse threaded.
I do have the plug for over #6, which is fine threaded.