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Thread: 4.3 to 5.3

  1. #1
    Join Date
    May 2009
    Location
    GA
    Posts
    553

    4.3 to 5.3

    Trying to do this swap and buy a used motor. what all will swap over from my 4.3 brackets and pumps etc. will the starter and ac pumps power steering swap over?

    i know i will need the harness, computer tuned for a v8, frame and motor mounts. what all else?

    truck is a 99 nbs 2wd auto.
    Last edited by Trevor; 05-20-2009 at 03:44 PM.

  2. #2
    Join Date
    Jan 2008
    Location
    Victoria, TX
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    326
    have you read the sticky at the top of this fourm? Lots of good info about your exact swap


    2011 4x4 6.2 Silverado ltz 6" fabtech lift 20" XD spy 35" nitto mud grappler

  3. #3
    Join Date
    May 2009
    Location
    GA
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    Yea i read that but it seemed to be more for a 6.0, also just read duckys thread but still not exactly clear on everything.

    I guess i just need to purchase the motor and then go from there on what i dont have and will need

  4. #4
    Join Date
    Aug 2007
    Location
    Honeywood, Ontario
    Posts
    6,994
    4.8,5.3,6.0 will all be same swap wise, if you are familiar with SBC's it's like 305 350 400
    2006 Silverado
    Little Black Bitch

  5. #5
    Join Date
    Sep 2005
    Location
    Austin Tx.
    Posts
    13,138
    When you buy the motor. Make sure you hgave EVERYTHINGGGGG. I mean make sure the harness is still attatched as in everything. Make your life a lot easier
    1951 3100
    1984 C10

  6. #6
    Join Date
    May 2009
    Location
    GA
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    well im probably buying the one in the classifieds here. Just need to know what brackets and accessories ill need to have my power steering alt ac oil pump all that to work.

    The sticky said i will need new fuel lines correct? or is that 6.0 related just wonder cause thats the first ive heard of that.

  7. #7
    Join Date
    May 2009
    Location
    GA
    Posts
    553
    Also a/c how will i go about hooking it up will my ac compressor work just mount it on the new 5.3 bracket? same with alt?

  8. #8
    Join Date
    Aug 2008
    Location
    North Texas
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    12,078
    Hardly any of it is the same. If you swapped in a Vortec 5.0 or 5.7 all of the front stuff would swap but since you chose the best route to swap to LS then all the stuff has to be changed.

  9. #9
    Join Date
    May 2009
    Location
    GA
    Posts
    553
    ok well i dont plan to do the swap in a weekend i plan to get all the parts together before even attempting to do this.

    ill post back here soon as i have another question so i can gather all my info.

  10. #10
    Join Date
    Sep 2005
    Location
    Austin Tx.
    Posts
    13,138
    If you have everything. It will only take a weekend. Its so simple. Looking back on my swap, woulda taken 3 days max with some as little expertise as myself and buddy with GENIII swaps, if we would of had everything. But I didnt, so I had to play cat and mouse trying to get parts
    1951 3100
    1984 C10

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