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#6
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L89 was not an optional engine; it was an aluminum cylinder head option requiring the L78 engine. Both L78 and L89 options appear on factory documents for these cars. It is my opinion the L78 total includes those built with L89.
Conversely L78 does not appear on factory documents for COPO cars; it was not required to order one. I have no idea why they would be included in the L78 total.
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