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Lightweight rotating assembly and a perfect balance job will help, but if you're making good power you'll tear the bottom end out of a stock block after awhile. A partial fill will help, aluminum main caps might help, aluminum rods would probably help on a drag motor, etc.

I've been on this board for about 10 years now and over that period of time I think most everyone who is racing with a stock block has eventually had an engine failure.

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Andy makes great points and we have seen many broken stock blocks.We are the fortunate ones at BGR since we have been building big and small block as well as Hemi strokers for more years than we can count on our hands and feet and have never had block failure.Rod or main damage or thin cylinders yes,catastrophic block failures,No.I hope I didn't just jinks ourselves.