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Thread: New optimizer Heads ID help

  1. #1
    Join Date
    Jul 2016
    Location
    Calgary, Alberta
    Posts
    2

    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)

  2. #2
    Join Date
    Apr 2001
    Location
    Newberg Oregon
    Posts
    12,282

    Default

    The one pic with the "Double Diamond" casting mark....Navistar casting

    Whats the story on the heads.?????

    They appear to have been installed on an engine.....silicone goop remnants on the Valve cover lip..

    The bolt hole pad shows having had contact....
    (1) 1995 Suburban 2500 4x4
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    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

  3. #3
    Join Date
    Feb 2012
    Location
    Pauline, SC
    Posts
    618

    Default

    Only sure way is the precups will have a ball to locate them in the head and be magnetic if china or other. Real gep will have non magnetic cups and a bump for the locator...
    1993 Chevy K3500

    owner - Twisted Steel Performance

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  4. #4
    Join Date
    Jul 2016
    Location
    Calgary, Alberta
    Posts
    2

    Default

    They came off a new optimizer motor, but the engine was for a hummer, so they took off the heads to put the hummer units on. Never been run apparently. I’m gonna have to check the pre cup as trailrider said.

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