C2- L78 piston rods - NCRS Discussion Boards

C2- L78 piston rods

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  • Robert M.
    Expired
    • April 30, 1999
    • 415

    C2- L78 piston rods

    There is a set of rods advertised on ebay as original and unused for a 396/425 corvette engine. How would these be positively identified as real?
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43193

    #2
    Re: C2- L78 piston rods

    Rob------

    If they're in the GM boxes, the part number will be GM #3856240.

    If they're not in the boxes, it becomes more difficult. However, the following may be identifying features:

    1) rib on the rod cap
    2) blue paint daub somewhere on the rod

    Now, comes the further question: why would you want these rods? While these rods are certainly ok, there's nothing really great about them. They're 4340 steel, shot-peened and magnafluxed, but they are 3/8" rod bolt rods.

    A MUCH better plan? Use rod set GM #12496661. This set includes 8 of the GM #10198922 rods. They're 4340, shotpeened, magnaflux inspected, AND theyre designed for 7/16" rod bolts. Far superior to the 3856240 and you can purchase a set of these for a very attractive price. They're not as good as some aftermarket rods, but they're FAR better than anything you'll EVER need for street operation. Until full car, x-ray inspection for NCRS/NCCB judging begins, no one will be the wiser, either.
    In Appreciation of John Hinckley

    Comment

    • Joe R.
      Extremely Frequent Poster
      • July 31, 1976
      • 4547

      #3
      Re: C2- L78 piston rods

      Joe,

      The X-ray (actually 3D CT)machines to accomplish this are in R & D as we speak. They should be on the judging field by the National Meet in 2050. Hope to see you there!

      Regards,

      JR

      Comment

      • Robert M.
        Expired
        • April 30, 1999
        • 415

        #4
        Re: C2- L78 piston rods

        Joe, As usual your common sense and knowledge shines through. Fortunately I don't need them as my engine is fine. I just wondered if they were a commodity worth having on the shelf. You answered that question.

        Comment

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