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The last post is correct; alternative heads had to be produced 100 times to be homologated. For the BMW 2002 there were 2 totally different 4-valve heads.
The 1300 BDA was a 1300 engine with again a 4-valve head; it was homologated in 1000 cc form (very early IIRC) and even 1150 form. Ford did its homework.
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