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For a "built" bottom end you need forged or a strong cast crank forged rods forged pistons then the whole assembly needs to be balanced and needs to be installed with high performance bearings and you should prabably have the block drilled for 4 bolt mains. With that set-up you should be able to withstand 500 horses easily however after that you have to realize that no matter how strong you engine your gonna break parts if you run that engine hard. What I have suggested here is an expensive set-up but for all but the most hard core car you can get away with less perhaps if you gave us a horse power and power adder(turbo, nos?)guid lines we can help you determine better what you need.
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Brent F
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