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Alum Head stamps

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  • Robert C.
    Expired
    • December 1, 1993
    • 1153

    Alum Head stamps

    On a 68 L-88 alum heads there is a stamped "HC" on the rear face , next to the square plug. There is also "A" stamped on the plugs. On the front face there is a "triangle" shape stamped and also an "R".
    Does anyone know what these stamps mean?
  • Warren F.
    Expired
    • December 1, 1987
    • 1516

    #2
    Re: Alum Head stamps

    Bob:

    According to the Corvette Restorer article written by Roger Gibson, on aluminum big block heads, they are inspection marks.

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