Big Block Weight Differences

Bewy said

I doubt it will be as much as 70lb, more like 40-50. BBM heads are not as heavy as some BB heads, so there is less weight saving.

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cast iron big block head is about 60#'s each vs aluminum head about 30#'s each.
There's 60#'s savings right there. the 440 block is several pounds heavier as well is the crank.