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Thread: 4.125 stroke

  1. #1
    Join Date
    Apr 2008
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    McAlester OK
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    344

    4.125 stroke

    Has anyone maid a ls 6.0 iron block into a 421ci for boost I have the block bored .030 and have a 4.125 crank and 6.125 rods and custom pistons maid for it with a 106mm turbo. Been reading and seen where people are saying going to have oil problems and it's not recommended for boost. And now I'm second guessing my build. Any info will help I really don't want to go a different route cuz I've done spent a lot of money. Sorry if my spelling is bad..

  2. #2
    Join Date
    Sep 2010
    Location
    San Antonio, TX
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    468
    Only thing I have heard is that the side loads will be pretty severe with that much stroke.
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  3. #3
    Join Date
    Apr 2008
    Location
    McAlester OK
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    344
    I'm just goin to put it all togather and rotate it and see what happens

  4. #4
    Join Date
    Nov 2007
    Location
    Pittsburgh, PA
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    3,581
    I personally would never use that combo with a standard sleeve block
    The 4" stroke has issues and that will just add more. If you want to use that get a longer skirt in that block or use a LSX block

    Depending on goal you don't need huge cubes and only wanting 800- 900 the stock motor is plenty
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

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