with aluminum rods the sky is the limit..as long as you can keep the bearing cooled and lubed..they take the shock load off the journals..impart a softer "push"..i believe imbalance and bad tuning is what break things..i have run cast 400 rods past 7000 rpm many times..455 over 6000..
those mains may be big, but they are durable..light rods and pistons will make sure of no issues..if you break it, ya tuned it wrong..imo
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