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Thread: Difference between GM engines.

  1. #1

    Difference between GM engines.

    I see them get talked about in terms of L36, L32, L67, etc...

    I know them better as say 3800 (and the series II), 3100, 3.1, 3.4 etc...

    So just to keep on the up-and-up, what are all the series of V6 GM engines and how they correlate to the specific size? Like is an L67 is series II SC, etc?
    And where do these terms like L67 and such come from? Something in the VIN or where?

    Most specifically, with my 94 GTP having the 3.4 NA, what one do I have exactly in the "L" sense?

    Just curious here, trying to be more educated about the engines.

    1994 Grand Prix GTP 3.4 DOHC

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  3. #2
    Your 3.4 DOHC is the LQ1. I believe these are the RPO codes. In my car, the RPOs are listed on the spare tire cover in the trunk. It's has lots of RPO's on it like BE3 for suspension..

    Engine RPO's that I know are

    LH0 3.1 MPFI
    LG5 3.1 Turbo
    LQ1 3.4 DOHC
    L82 3100 small port
    LG8 3100 large port
    LA1 3400
    LX9 3500
    LZ4 3500 VVT
    LZ9 3900 VVT
    LZ8 3900 VVT (DOD?)

    Sorry, I don't know a whole lot about the evil 90* motors but...
    L27 3800 S1
    L67 3800 S/C S1-2
    L26 3800 S3
    L32 3800 S/C S3
    The 90* motors are dead now, thank god. They were killed by the far superior 60*

    1990 ASC/McLaren Turbo Grand Prix 3500 swap GT3076R turbo 40lb/hr injectors FMIC LX9 coils Megasquirt2 v3.0

  4. #3
    4x4 status FTW! [ChaosweaveR]'s Avatar
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    Dec 2009
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    Exactly, the RPO codes GM uses to classify which motor is which, same for suspension and brake systems among other things.

    Of course, there's the newer 60*V6 DOHC motors too

    LY7 - 3.6L DOHC
    LLT - 3.6L VVT DOHC

    I know there are a few other variants of the 3.6L DOHC V6, but I'm not 100% sure on the RPO codes.
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  5. #4
    Because stock sucks... pocket-rocket's Avatar
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    I wish my 92 had an LSx, more specifically an LS9 >.>
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