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Remanufactured PRO-Series Longblock GM 6 Cyl., 4.3 Liter Gen+ 262 V6 (Left-Hand Standard Rotation) with remanufactured Vortec cylinder heads. Replaces 2000-2007 GM 4.3L balance?shaft marine carb or MPI engines with electric fuel pumps, roller rocker?arms and crank position sensor.NOTE 1: May also require the harmonic balancer p/n 888776T to be ordered separately when replacing carbureted engines w/o the crank position sensor.NOTE 2: Can be used to repair CARBURETED ONLY 2007?2016 GM 4.3L balance?shaft marine engines with 58X crankshaft timing wheel, electric fuel pumps, roller rocker?arms, crankshaft position sensor. NOT FOR USE with MPI models (SN# 1A063240 and up).