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Crossbolted main caps are the quickest way to spot that this is no ordinary RB block, as only Hemi blocks used them. The aftermarket World Products cast block features actual Mopar insignia and a Mopar part number. Strengthening ribs on the sides of the block help keep these castings in one piece well north of the 1,000hp range. An aluminum block is offered for those wanting a “light” 600-plus cube engine.