2008 Suburban HD - 8.1L swap (frankenburban 2.0)

Discussion in 'The Driveway (build threads)' started by fidelity101, Sep 1, 2017.

  1. VisionxOrb

    VisionxOrb 1/2 ton status

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    This thread is so full of win. I've been literally waiting for 10 years to see a 6l90e behind a 8.1!!

    Now would a duramax flexplate bolt to a 8.1? I ask because the duramax does come with the 6l90e in an express 3500 van.
     
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  2. fidelity101

    fidelity101 1/2 ton status

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    No I don't think so, their cranks are different is my understanding. I did look into this route though.

    Right now I'm sorting out the intake ducting and hopefully have a startup vid this weekend.
     
  3. fidelity101

    fidelity101 1/2 ton status

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    So it turns out you need to put weld nuts or rivet nuts in all of the unused locations on the core support because the fan shroud is different between the small/big block so you need to use those to attach the upper half of the fan shroud.



    Need to hook up the heater core lines and then add fluids and we are ready to test fire later today. Not sure how well the truck will run without the maf hooked up, waiting on the intake kit to come in the mail and that should be the last thing before getting a tune done.
     
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  4. fidelity101

    fidelity101 1/2 ton status

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    Happy belated friday the 13th! got some fluids in and with everything hooked up, it started and runs and idles! no scary story here :)



    The stock intake (LY6) has too many resonators on the piping they collide with virtually everything, otherwise it should fit but with the 8.1 TB kind of clocked upward a bit I am worried about hood clearance. I will try and junkyard a solution meanwhile I wait for my flowmaster unit.

    All that's left to do:
    • Resolve the intake piping issue,
    • Weld minor exhaust leak
    • Bleed the air out of the coolant
    • Finish installing the fascia
    • Tune/Re-calibration
     
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  5. ZooMad75

    ZooMad75 1/2 ton status Premium Member GMOTM Winner

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    That is drop dead sexy right there. Nice work dude. Just the way the general should have built them.
     
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  6. Chevy305

    Chevy305 6 Lug 14bsf Status Premium Member GMOTM Winner

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    Hey you have a check engine light on :whistle:
     
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  7. fidelity101

    fidelity101 1/2 ton status

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  8. 78K30

    78K30 1/2 ton status Premium Member

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    So much want! But much less money haha good luck with the sale, it shouldn’t last long.
     
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  9. fidelity101

    fidelity101 1/2 ton status

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    eh send me an offer if your serious but I know Iowa is a bit far away. I'm right now trying to make cash on some local idiot who is gonna waste his time all winter building a project that will never finish.

    anywhoo.... Can't really proceed without the new intake because I can't close the hood and drive.
    [​IMG]

    Wednesday can't come soon enough! Even though I think I may need to get an 8.1 specific intake piping due to the angle of the dangle of said throttle body but this was good enough to get it idling long enough to check for leaks and help bleed the coolant, recharged the A/C etc. Also managed to install the fascia 100% over the weekend.


    literally the only remaining steps:

    • Check/add transmission fluid
    • Intake piping
    • fix minor exhaust leaks
    • bleed coolant more?
    • Tune
     
  10. jekquistk5

    jekquistk5 Weld nekid Premium Member GMOTM Winner

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  11. 85k5witha6.2

    85k5witha6.2 1/2 ton status Premium Member

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    The heads go for more than double that easy.
     
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  12. fidelity101

    fidelity101 1/2 ton status

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    I'm tempted to do a 1 cyl rebuild and put it in something else, always wanted to a c10 burnout machine, one of these and 4.10s would do the trick. or a boat...
     
  13. 85k5witha6.2

    85k5witha6.2 1/2 ton status Premium Member

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    I would've just dropped the pan and put 1 rod bearing in it haha
     
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  14. VisionxOrb

    VisionxOrb 1/2 ton status

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    If the frames/core support are basically the same, why couldnt you just bolt in the intake piping from the 8.1?
     
  15. 454Sub

    454Sub 5/8 ton status Premium Member

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    In high school a friend of mine overheated his 88 K5 and it started knocking, at the time we didn't have access to a cherry picker or any "fancy" tools. We limped it to AutoZone and changed 2 rod bearings in the parking lot and boiled the tires when we left a few hrs later.
     
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  16. Big Ray

    Big Ray 1 ton status Premium Member

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    :eek::eek::eek::eek::eek::yikes::yikes::yikes::yikes::yikes:
     
  17. Justin V

    Justin V Momma's Biscuits Premium Member GMOTM Winner

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    Pics or it didn't happen
     
  18. Big Ray

    Big Ray 1 ton status Premium Member

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    Damn nice job you're doing!
     
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