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