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Old 03-07-2013, 03:41 PM
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Using a sbc crank w/a bbc snout should have held up, along w/splayed 4-bolt caps. But at some point, the caps will begin to move, regardless.

The iron LSx blocks are tough- and crossbolted. The LS crank snout is a bit over 1.48" (sbc is about 1.245", bbc is about 1.6), the wrist pins are bigger, has a bigger main journal size (about 2.56"), even the cam is bigger in diameter.

Stock LS cranks have been used to make more than the power you're aiming for, but a Roots blower will impart more load than NA or even a turbo application, so aftermarket forged is a good insurance policy if it's in the budget.
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