Nice cars Alex.
Stock caps are not known for much strength! Aluminum rods like BME or GRP and splayed bolt steel caps probably would have kept that one together!(certainly longer) Aluminum rods act somewhat like harmonic shock absorbers. Factory N cranks are actually very strong but they are also very hard and more sensitive to harmonics/flex than a forged or billet crank(both are more flexible). Not advocating cast crank over forged or billet, just I am aware of a few cast crank motors well over 1000 hp that didn't break the cast crank or if they did, it wasn't crank failure that caused the crank to end up broke.
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