23-04-2019, 01:03 PM
Usually the overflow is a 1/4" or smaller copper tube running from inside the radiator filler neck either through the neck or through the side of the header tank and down to low level at the side of the radiator. Specials may have a separate header tank, usually with a modern pressure cap, in which case the overflow runs from the neck of that tank just above the pressure seal.
Robert Leigh
Robert Leigh