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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 LOW Compression 16:1 build is designed for backing off the IVA's and single Turbo'ing your ACERT engine. works for either ESN: MXS/NXS LONG BLOCK BUILT WITH 6615 KIT LOW COMPRESSION 16:1 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.