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This rebuilt basic long block that was built using IPD parts and is designed to reduce down time by covering all the major castings and timing of the front gears. This 18:1 compression stock build is designed to be a direct replacement for your standard twin turbo C15A long blocks to complete into a C15A engine. This Build works for either ESN: MXS/NXS 500-550hp engines. LONG BLOCK BUILT WITH 4787 STOCK 18:1 PISTON COMPRESSION. LONG BLOCK INCLUDES: -CYLINDER HEAD -CAMSHAFT -CYLINDER BLOCK -CRANKSHAFT -TIMED FRONT GEAR TRAIN -CONNECTING RODS -ALL OVERHAUL GASKETS This long block is sold with a 1 year/unlimited mileage warranty.