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World Product's Motown block features high-density cast-iron and is reinforced in all critical areas. The front and rear bulkheads are substantially thicker than stock and the reinforced main webs accept dowel-registered nodular iron four-bolt main caps secured with 1/2-inch bolts, a priority main oiling system, and thicker cylinder walls. This block also features expanded water passages to allow improved cooling for big displacement. To learn more visit www.theengineshop.com.