The PCV system (without the draught tube) was called the 42 engine, at least in the Australian manuals.
The first and last pictures of the heads show the 21 stud British made heads.
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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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