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Still working on my 65 Merc's secret past...this time I'm trying to nail down the engine's year, as the PO seemed to think the engine was post-1965. It's a 300ci 6. Anyway, the code on the block is as follows, as best as I can make out:
D5TE(?) - 6015-AA
I'm not sure about that 'E', fourth letter. The rest I'm between 95 and 99% sure. Thanks for any suggestions!