Safe RPM for a 408" Magnum?

Till it chucks a rod out the side. Then build anudun and don't spin thatun as hard.

I hope not Rusty, but it happens. The rods and rod bolts are pretty stout units, and it was carefully machined and assembled. If it does happen, I'll build an even stouter 408" with lower compression and supercharge the thing with a belt driven, intercooled centrifugal supercharger.