Farmall H Fitting on back of head whats it for?

[c brown]

im putting back a farmall h that was given to me, and on the back of the cylinder head below the valve cover is a brass fitting threaded into head, its not the water temp area thats around the corner oil pressure seems to be down on block, was this a cap plug at one time? any info helps, also the manifold has a hole on the side can i just use high temp jb and plug it up? there is also a flap or closer gate that is rusted up whats that for help warm up?
 

[Janicholson]

It is a fitting for a pipe to the air cleaner to allow a measure of Positive Crancase Ventilation.
There is a mating spot on the Air Cleaner to which a pipe is attached. Jim
 

[Zachary Hoyt]

That fitting goes to a line that goes to the air cleaner as I remember. It is a crankcase vent and sends the air back into the carburetor stream. The manifold you are describing sounds like a kerosene or distillate manifold, they had a system to help the engine warm up more rapidly but you do not need that unless you are trying to keep it authentic.
Zach
 

[Wayne in MN]

Connect it to the air cleaner. It is part of the breather system to remove blowby gasses from the valve cover area.
Connects in the front to the governor housing.
 

[c brown]

ok thanks i see where it goes know