Jim if your efforts fail to turn up a result, there is a guy(on the Ford barn forum) who makes and sells a pressure release valve that connects to the overflow pipe (which is what the Australian carriers have) If I recall it runs at 3.5 lb which is about right for a wartime radiator.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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