Re: Military flathead engines
From what I've read about Royal Enfield motorcycles, the UK did require the manufacturers of unused surplus made under wartime contract to take it back without payment. If this applied to Ford Dagenham then they may have ended up with surplus new engines but I would have no idea about how many or if they made changes to the 21-stud design from the Dearborn or Canadian produced 21-stud engines. Most Dagenham produced 21-stud engines also had the firing order casting marks on the cylinder heads but I don't know if this started with military production or civilian. Dagenham was certainly the last branch to manufacture the 21-stud 221 design block.
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