1970-72 LT-1 Oil Baffle - NCRS Discussion Boards

1970-72 LT-1 Oil Baffle

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  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43211

    1970-72 LT-1 Oil Baffle

    I recently had a question regarding whether, or not, 1970-72 LT-1 engines with 5 quart oil pans (i.e. non early 1970 and non ZR-1)were equipped with an external oil baffle ("windage tray"). A lot of folks are of the opinion that they were not so-equipped. That's incorrect. Most, if not all, 1970 LT-1 with 5 quart oil pans and all 1971-72 LT-1 with 5 quart oil pans were equipped with an external oil baffle. 1973-75 L-82 may also have been equipped with this baffle.

    The baffle used, GM #3989075, was similar to the 1969-73 Z-28 baffle GM #3927136 which was likely also used for 1970-72 Corvette LT-1 with 6 quart oil pan (i.e early 1970 LT-1 and all ZR-1) except the 3989075 was shorter. The 3927136 was also used for all 1976-81 Corvette L-82. The GM #3989075 was discontinued without supersession in October, 1992 and the 3927136 was discontinued within the last few years. The 3989075 can be fabricated by shortening a 3927136.

    I actually installed a 3989075 on my 1969 300 HP 350 when I rebuilt and restored the engine. A photo of that installation is shown below. There are also photos of an NOS GM #3989075 [not for sale] shown below.
    SmallBlockWindageTray.jpgDSCN4016.jpgDSCN4017.jpg
    In Appreciation of John Hinckley
  • Bill B.
    Very Frequent User
    • August 1, 2016
    • 303

    #2
    Re: 1970-72 LT-1 Oil Baffle

    Outstanding, Joe!

    Thanks for the photo documentation!
    Bill Bertelli
    Northeast and Carolinas Chapters Member
    '70 Resto Mod LT-1 w/ partial '70 ZR-1 drivetrain

    Comment

    • Dennis D.
      Extremely Frequent Poster
      • March 1, 2000
      • 1071

      #3
      Re: 1970-72 LT-1 Oil Baffle

      I notice an oval hole in your baffle. My 70 LT-1 (july car), baffle has a round hole.

      Screenshot_20221120_122813_Gallery.jpg

      Comment

      • Joe L.
        Beyond Control Poster
        • February 1, 1988
        • 43211

        #4
        Re: 1970-72 LT-1 Oil Baffle

        Originally posted by Dennis Delpome (33752)
        I notice an oval hole in your baffle. My 70 LT-1 (july car), baffle has a round hole.

        [ATTACH=CONFIG]114245[/ATTACH]
        Dennis------


        The 3989075 had no predecessor (or successor) part number so, apparently, there was a change in specification at some point.
        In Appreciation of John Hinckley

        Comment

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