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Anchoring the foundation of the 582 BBC is a Dart Big "M" block, which contains three-splayed main caps, thicker-than-normal deck surfaces, and added material within the webbing. All is required for reliability and strength. Each block is honed specifically to the engine's intended use for the ultimate in ring seal and oil control. The 582 HHR (hot hydraulic roller version) being built here contains a final bore of 4.6-inches.