Fittings on flathead

[Dave Klein]

Hi and good morning to all, I'm putting my 46' flathead motor back on the frame and have a question....On the head is a hole with 3/8 pipe thread that I can't remember what went there. It is at the rear left of the head and I do know it is part of the cooling system....It's not the temp sending unit, thats on the side of head above the starter....I can't send pics..
Thanks, Dave

[bmorgil]

Hello David, it is the "port" for the heater by-pass. If there is a Heater in the vehicle, there is a valve there that controls the flow of water to the heater. If there is no heater, it is plugged.

[Dave Klein]

Great...Thanks..I'll put a pipe plug in it, I live in Fl.

[gmwillys]

Definitely no need for a heater in Florida, but just incase anyone is interested, the following link is for the OEM style coolant shut off valve;

https://www.kaiserwillys.com/products/manual-heater-control-valve-fits-41-71-jeep-willys/