C7Ra is later head (suit the C59a, C69a etc. block- 45 to 48) In 1942 Ford shifted the valve line up in the block. This required the earlier heads to be ground out to fit these later blocks.
Those heads came in Cast iron and Ali. The Ali heads give the higher comp. ratio of the two. Both are good with regards the C.R.
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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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