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motown small block street blocks world s motown block is without a ... engine builder friendly cast iron block on the market and because of its ... it s worth up to 20 hp more than other blocks on the market at first glance one of ... the world motown and oem chevrolet blocks are the bulges at each cylinder.that ... to provide required cooling the motown block can be bored to 4.200 with a .250 ... differences between world s motown block and an oem casting include creating ... will expand at the same rate as the block promoting superior main bearing life ... of bearings as with other aftermarket blocks and pick out the same-sized ones ... because the block isn t step-bored solid pan rails are ... can be used without clearancing the block stocktype oil pans can be used no ... can be used most importantly the block is manufactured in its entirety to qs- ...