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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Crankshaft is lighter, pistons are lighter, rods are lighter intake manifold is lighter it adds up, it's about 35-40 pounds less in heads, it's 25-30 pounds lighter from rb to b block, stroker stuff is easily 5-10 pounds lighter,