340 x-block vs. 410 stroker ?

My 410 rev's 8000+ no problem and extremely quickly. My heads stop flowing at 5800. I can shift @ 6200 or 7200 rpm's or higher but still get the same et so why ?

ir3333 said

I don't know what each engines maximum limit would be.
..maybe the amount of fuel you could get through it or piston speed at some point?

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