Is there a vacuum tapping at no. 4 cylinder? (#3 and 4 are siamesed?) As Mike said, A lean mixture puts the temp way up. This was the reason Ford built relieved blocks, because vaccuum brakes caused the engines to lean out and cracked the blocks from valve seat to bore. The other likely cause is detonation.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
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So many questions....
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