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Chevrolet Performance's LSX Bowtie iron block offers quite a few features not found on factory LS blocks. The additional two head bolts per cylinder bore, thicker deck surfaces, and billet steel main caps add tons of additional strength. Other refinements include improved bay-to-bay breathing, doweled main caps, a seventh transmission bolthole, and a priority main oiling system. So yes, it weighs more than a stock aluminum LS3 block, but it's much better suited to handling boost.