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  1. #1
    Join Date
    Jul 2016
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    Calgary, Alberta
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    Default New optimizer Heads ID help

    I’m looking at a set of (95% sure) new optimizer heads.
    Can you folks decipher the casting numbers for me. It has what appears to be the Navistar casting marks
    S/N # 10137667
    S6090 (this one could be upside down. It works both ways 0609S)

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