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The Oil Pump on LS7 Engines has been changed to a two rotor design, and the Crank Shaft End is longer to accommodate both rotors. Currently Essential J-41558 Crank Shaft Sprocket Remover will not fit this longer Crank Shaft. J-41558-10 consists of a Pair of longer Bolts, which are used with the Body of J-41558 and previously Essential J-8433 Puller to remove the Crank Shaft Sprocket. Unapproved methods may damage the Crank Shaft or Sprocket.