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I have a destroked bb crank around somewhere, when I run across it I'll weigh it--
I have seen 500 in bb that went over 10000rpm. In 1980s my 4 in stroke engines repeatedly came back with the tattle tale tack at 10.3
This sbc crank I weighed is only a 3.75 stroke--and all your 427 small blocks will be 4 or 4.125 stroke whereas I can do a 427 bb at around 3.78 to down around 3.25 stroke and the bigger bore will let me use some much bigger valves ---
I think we got a crank in today for a 427 sbf so I'll weigh it later or maybe tomorrow.
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