1972 Corvette Water Pump Usage - NCRS Discussion Boards

1972 Corvette Water Pump Usage

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  • William M.
    Expired
    • August 31, 1974
    • 113

    1972 Corvette Water Pump Usage

    FYI - 1972 Corvette Water Pump Usage

    Corvette 350 Engine
    Picture # 1) 3991399 water pump for 1972 Corvette application was cast on the following days(H261,
    H271, H301, H311, I171, I201, I211. A122, C82 and C92)

    Picture #2) 330813 water pump was cast starting in mid-April 1972 with transition in May 1972 from
    the 3991399 until the 3991399 stock was depleted. This 330813 water pump is super rare.

    Picture #3) The unique boss on the 330813 which was not machined for a bypass like later 330813
    pumps after 1972 Corvette production that had the boss tapped and a square plug installed.

    Corvette 454 Engine
    Picture #4) 3992077 water pump used throughout 1972 Corvette production.

    Your comments please.
    Bill Mock #93MVC-008S.JPGMVC-009S.JPGMVC-010S.JPGMVC-011S.JPG
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43220

    #2
    Re: 1972 Corvette Water Pump Usage

    Originally posted by William Mock (93)
    FYI - 1972 Corvette Water Pump Usage

    Corvette 350 Engine
    Picture # 1) 3991399 water pump for 1972 Corvette application was cast on the following days(H261,
    H271, H301, H311, I171, I201, I211. A122, C82 and C92)

    Picture #2) 330813 water pump was cast starting in mid-April 1972 with transition in May 1972 from
    the 3991399 until the 3991399 stock was depleted. This 330813 water pump is super rare.

    Picture #3) The unique boss on the 330813 which was not machined for a bypass like later 330813
    pumps after 1972 Corvette production that had the boss tapped and a square plug installed.

    Corvette 454 Engine
    Picture #4) 3992077 water pump used throughout 1972 Corvette production.

    Your comments please.
    Bill Mock #93[ATTACH=CONFIG]49118[/ATTACH][ATTACH=CONFIG]49119[/ATTACH][ATTACH=CONFIG]49120[/ATTACH][ATTACH=CONFIG]49121[/ATTACH]
    Bill-----


    Yes, there's no doubt the untapped 330813 would be extremely rare. It was only used for a portion of one model year and the only application was Corvette although it's possible that some MD/HD trucks used it for the short period in the 1972 model year.

    Actually, I'm surprised the 3991399 is not more rare than it is. It was only used for about a year and a half and only on Corvettes and, possibly, some MD/HD trucks.

    I really wish that GM had not gone to the 330813 pump for Corvettes. It's such an "ugly" pump with the unused bypass boss with square head pipe plug.
    In Appreciation of John Hinckley

    Comment

    • Patrick H.
      Beyond Control Poster
      • December 1, 1989
      • 11643

      #3
      Re: 1972 Corvette Water Pump Usage

      Bill,

      My previous threads on this exact subject:

      https://www.forums.ncrs.org/showthre...ghlight=330813

      https://www.forums.ncrs.org/showthre...ghlight=330813

      Let me know what you think.
      My feeling is that the untapped 330813 was used on very, very few Corvette engines.

      Patrick
      Vice-Chairman (West), Michigan Chapter NCRS
      71 "deer modified" coupe
      72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
      2008 coupe
      Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

      Comment

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