the above statements are all so similar for a reason... they're basically 100% right.
If you plan on a blower and you can't be happy with less than 450rwhp then you absolutely had better buy yourself a bottom end that's built for the power. I've seen enough stock mustangs rattle the bearings out of the rods (which is immediately followed by a fist size window in the block) with 360rwhp and less to have learned. If you want it to last and be fast then build it right and maintain the PISS out of it or just forget about it.
The stock crank isn't worth keeping if you're going over 450rwhp since by then you've either set the clock on your time bomb and will be replacing your engine entirely soon or you've built a motor correctly for running >400rwhp through.
It's not like it magically comes unglued after 450, they just beat the piss out of themselves and if you get a bad sip of gas or a hiccup in the tune or any number of things go the slightest bit wrong and you've got a crate full of broken shit under the hood. Some guys like Stanger00 are right at the ragged edge of what's sensible. He knows how to fix his own shit too. If you don't then you need to be more cautious and spend more money up front.
Save time, save money, build it for boost, then run boost. After you've got that power and it's reliable, come back and say thanks for warning you.
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