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Swap Blockâ„¢ Mock Up LS Engine Block GM truck electric fan Check out the videos ofThe ORIGINAL Lightweight Steel LS Swap Block Engine: Gen III LS, Gen IV LS Years: 1997 2020 Our patent pending swap block uses our unique tab and slot design to provide accurate mounting positions of engine accessories and bolt ons. This distinctive design is lightweight and comes disassembled for ease of shipping and storage. Precision formed returns on all weight bearing components and tight tolerance slots create a rigid and accurate representation