What numbers on the fan & water pump Pulleys? - NCRS Discussion Boards

What numbers on the fan & water pump Pulleys?

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  • Paul C.
    Very Frequent User
    • November 11, 2007
    • 511
    #1

    What numbers on the fan & water pump Pulleys?

    What are the correct numbers on the 71 LT-1 fan and water pump pulleys? 3991425 for water pump? Fan pulley?
    Tags: None
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    • Joe L.
      Beyond Control Poster
      • January 31, 1988
      • 43195
      #2
      Re: What numbers on the fan & water pump Pulleys?

      Originally posted by Paul Cook (48167)
      What are the correct numbers on the 71 LT-1 fan and water pump pulleys? 3991425 for water pump? Fan pulley?

      Paul------


      The 2 groove waterpump pulley should be GM #3991423. The 1 groove pulley (AIR pump driver) should be GM #3991425.
      In Appreciation of John Hinckley
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        • Paul C.
          Very Frequent User
          • November 11, 2007
          • 511
          #3
          Re: What numbers on the fan & water pump Pulleys?

          The single fan pulley is 3991425BX.

          The 2 groove water pump pulley is 3991423BW

          I guess everything is correct.

          THANK YOU.
          Last edited by Paul C.; January 6, 2016, 06:47 AM.
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