When I don't know I'll tell you Andy - I don't know the answer to your question. As I recall, there was a 400 block that ended in 817 during the 70s. We all felt that it was the highest quality block that we produced. It was the only block that was cast using a single core to form all of the bores and bulkheads. So, it was a lot more dimensionally accurate then the multiple cylinder bore cored blocks.
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