Super Six head compare

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in Hudson 1916 - 1929
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      HeadCompare.jpg
    I posted the same question to HET Club forum.  Can you use a later head 1920s on an earlier motor.  There is one extra water hole on each end (circled in yellow) that could be plugged up, but has anyone done this?  Asking for a friend...

    Hudsonly,
    Aaron


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