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  1. #1

    Post Pistons,Rods, and Crank in a LM7 Vortec 5.3L?

    Does anyone know what kind of pistons, rods and crank shaft are in a stock LM7 Vortec 5.3L. Any help would be appreciated.

  2. #2
    Jr. Apprentice
    Join Date
    Oct 2010
    Location
    Frederick, CO
    Posts
    24

    Default

    What do you want to know, material, bore x stroke, rod length?
    bore is 3.779 and stroke is 3.622 sorry i can't find rod length, but the rods and crank are the same as an ls1 dimensionally.
    you can take a 5.3 block and bore it (i believe) .010 and put ls1 pistons in it and the ls1 crank is needed to support the extra weight of the pistons

  3. #3

    Default

    Mainly material. Forged,cast iron, etc.

  4. #4
    Jr. Apprentice
    Join Date
    Oct 2010
    Location
    Frederick, CO
    Posts
    24

    Default

    I believe the crank is just a cast crank, and the pistons are cast aluminum and cast rods

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