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10.200" BBC Engine Block, Aluminum, Machined @ Dart, 4-Bolt Mains, Bored 4.555" Diameter (Ready to hone to 4.560"), Machined Lifted Bores .904", Machined Cam Tunnel 55mm, Inlcudes Roller Cam Bearings, Decked, 2-Piece Rear Main Seal, Chevy, Big Block |