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OEM pistons

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  • Mark #44888

    OEM pistons

    I'm rebuilding my 1970 L46 350, and notice the old pistons are stamped underneath with TRW G 202-99....

    Did TRW supply GM originally, or has my motor been torn down before?

    Thanks - Mark
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43193

    #2
    Re: OEM pistons

    Mark-----

    TRW supplied the forgings for the pistons, but I believe that the pistons were machined at the GM engine plants just like all other pistons. In any event, the pistons usually have a GM part number (for the forging---not the finished piston) on the bottom. I would not rule out the possibility that some were supplied with TRW markings.
    In Appreciation of John Hinckley

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