1974 8-seater microbus mechanical rebuild

[Mordred]

I believe it is the location of the temperature sender for a Fuel Injected system.  Often the later heads have them as standard as there where a lot of FI systems fitted in the US there from 1974.  I cant remember if it is a blind hole or not, but I suspect someone has just fitted a stud in it to close it out.

Someone might like to confirm that.

Adrian