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BDR Engine blocks


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can anyone confirm roughly how many BDR's were made with the standard 711M block as opposed to the later and stronger AX block?

Just seen that mine is fitted with the 831C block, an early AX block and wondered how rare this actually was. It's the original block and head as they share the same BDR engine number.



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My 1987 BDR engine was purchased direct from Cosworth, apparently slightly modified but forgotten how. It has 711M on the side. I sort of gather that as a result my BDR isn't BDR coded, because the CKD chassis wasn't bought with the engine included. So however many were built, mine is plus one.

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