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#1
14-10-16, 02:02
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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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#2
14-10-16, 14:06
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Aha! So that explains why I had to have slight amount shaved from my heads, immediately above where the valves lift. Without doing that, the valves would/could have struck the edges of the underside of the relief in the head. Knew there must have been a reason why that became an issue. The French blocks must have been 42 or later in valve design?
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Ford CMP, 115" WB,1942 (Under Restoration...still) Medium sized, half fake, artillery piece project. (The 1/4 Pounder)
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