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Chevrolet Performance LT1/LT4/LT5 Aluminum Engine Block - 9.240 in Deck - Standard Main - 6-Bolt Mains - 1-Piece Seal RTP1000252 SR-1's performance is not compromisedProduct Description: Engine Bare Block 4. 065 in Bore 9. 240 in Deck Standard Main 6 Bolt Mains 1 Piece Seal Aluminum Natural GM LT Series Sold Individually Chevrolet Performance has a wide selection of performance upgrade parts specifically for GM vehicles, as well as crate engines, you can add proven performance to stock vehicles. Looking to personalize your vehicle? Chevrolet Performance is the place. Inside youll discover a complete portfolio of