Posted by Clint Dixon [74.206.62.210] on Saturday, April 11, 2015 at 08:07:07 :
In Reply to: Flat head to radiator castings are different posted by Tom in Oregon [71.193.184.10] on Friday, April 10, 2015 at 23:45:10 :
The one with the port connects with a short hose to a fitting on the top of the water pump providing a bypass. It is the older of the two. The one without the port relies upon bypass through the head. Unfortunately, though your your broken one is newer, it seems to be the harder of the two to find.
Junior