Re: 1970 3963512 Block Strange One
Are you sure this was the original engine? If it was a demo, it might have had the block replaced under warranty, and they replaced it with a 4-bolt. Years ago I lucked into a 512-casting block that came out of a "totally original" Caprice wagon. Turned out that the block had been replaced by the dealer early in its life. It had a CE stamping. All the internals were low-horse 427, but the CE block had evidently been in-stock in the parts dept. and that's what they swapped in as a replacement.
BCD
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