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Thread: Educate please

  1. #11
    Senior Member scoutingranch's Avatar
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    Now the fellow with the M38 has informed me that he is looking for an L134 industrial head, as that, is what they came with originally. Is this accurate?
    I'm still learning, so I don't know beans.
    "Options are for girls"

  2. #12
    Super Moderator LarrBeard's Avatar
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    Cylinder heads for L-134 engines are the subject of much myth and legend.

    If you Google "L-134 Cylinder Head", pretty soon you will be in information overload.

    The "Kaiser Supersonic" head gave a 7.1 compression ratio and was similar to the high altitude head. The "standard" was about 6.48, maybe 5 HP difference..

    Industrial heads may or may not have had lower compression ratios depending on what the researcher can find on his particular head. Most have been planed and measurements are no longer original.

    The M38 engine may have had the same compression ratio as an industrial engine, but it would take a comparison of the part number cast in the head to see if they are the same casting.

    https://forums.g503.com/viewtopic.php?t=237948

    SO, the answer is a firm "Could be, but...".
    Last edited by LarrBeard; 06-06-2020 at 09:12 AM.

  3. #13
    Senior Member scoutingranch's Avatar
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    Thank you. I read the link. A good reminder for me to stay with CJ's and away from Mil Spec items as that stuff would drive me crazier.
    "Options are for girls"

  4. #14
    Super Moderator gmwillys's Avatar
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    Our '46 has the Kaiser Supersonic head. It has better then average performance in comparison to some other heeps that I've had.

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