Weisco k1 rotating assembly question

I was reading a article called build a streetable 530hp stroker, chryslers early 5.7 gen 3 hemi. In this article the man building the engine says that the 345-397 stroker kit he purchased was a direct fitment, by reading it he says no grinding the block at all. My question is ?.. Is this even possible I always thought u would have to bore the block a bit for pistons to fit? Or maybe I'm reading it wrong it's a older article from hotrod.com


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