V8

I remember reading posts on how to do this on the old Fordbarn and also on BillB's Flathead website. It's also covered in one of the books I have on Flathead engines. As I recall it involves plugging a small coolant passageway in heads and/block using a threaded plug. Maybe if you temporarily mount the heads on the deck it will be obvious as to which holes need plugging.
 
Look at the front holes in the mating surface of the head, if you put a 59AB gasket in position on the head, it will become apparent... Probably use 1/8" pipe, and file to deck surface, put tape on the end of the file to avoid marking head surface... Karl
 
The internal wrenching types are short and could be set flush depending on how the NTP threads are cut. If you start with a tapered reamer for NPT angle it makes life easier but take care, you don't want to set it too deep.
 
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