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Thread: Official NBS 4.3v6 to GEN 3 V8 swap Guide

  1. #291
    Join Date
    Sep 2007
    Location
    Broken Bow, OK
    Posts
    1,434
    Do the VATS relearn. You have all the VATS equipment, you don't need it disabled, just the relearn.

  2. #292
    I didn't get tuned.I was using the stock v8 ecu instead. So I have too take the truck too dealer? This swap is a pain in the butt. All this info wasn't posted anywhere
    The fuel pump does prime tough.
    Last edited by b18c1turboedek; 10-13-2010 at 05:56 PM.

  3. #293
    Join Date
    Feb 2010
    Location
    North County San Diego
    Posts
    61
    I'm getting ready to do the swap and I have spent allot of time on this board reading and all you need to know is right here!!! I'm not trying be an ass..... take a second, grab a cup of joe or a cold beer and take a look at this site and posts. You'll find a ton of info!!! Trust me...

    Carnell

  4. #294
    Join Date
    Sep 2007
    Location
    Broken Bow, OK
    Posts
    1,434
    No, the VATS relearn is something you can do yourself.
    key on, crank (no start), wait 10 minutes (600 seconds) (not a second less) with key on run, shut key off, replete 2 more times. the 4th crank try it will start (if it was a VATS issue.)

    I'm not entirely convinced this is your issue though since you say the starter isn't cranking. Generally VATS issues give a crank and start then immediately die.

    Try it though, because your VATS will have to be relinked since you swapped PCMs. It is something you will have to do anyway.

  5. #295
    Awesomel you have been a great help man..



    And for the post above. I never read anywhere about the vats system in this thread. I have read as much as I could also. I'm just new too the Chevy world.

  6. #296
    Join Date
    Apr 2009
    Posts
    115
    Quote Originally Posted by zebra View Post
    a 5.3 crank will get you a high compression 5.3 with those flat-top 4.8 pistons. as for any other differences - someone else can chime in on that
    If you use any crank other than 4.8, you also need any rods other than 4.8. The 4.8 got longer rods to make up for the shorter stroke.

  7. #297
    Join Date
    Feb 2010
    Location
    North County San Diego
    Posts
    61
    Well I'm good. Looking at the casting numbers, I do have a 5.3. Simple mistake by the shop I should be getting the block back tomorrow from the machine shop. I'll start putting the engine together this week and have a planed install date of Nov 12th and 13th. It would be sooner but I have to play Navy the next few weekends.

  8. #298
    Join Date
    May 2009
    Location
    hot & windy
    Posts
    1,117
    Quote Originally Posted by gottaswapup View Post
    If you use any crank other than 4.8, you also need any rods other than 4.8. The 4.8 got longer rods to make up for the shorter stroke.
    whoops, yeah, i forgot to mention those, but you've got a 5.3 anyway, so it don't really matter
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

  9. #299
    Join Date
    Oct 2010
    Location
    Alvin, Texas
    Posts
    2

    Emissions testing

    Ok, if this question has been answered already I apologize. But, I live in the Houston area my county requires me to get an emissions test when I get my inspection sticker. My question is does anyone know what will happen when the guy at the station hooks my truck up to the state computer and it says I have a 4.3 V6 and he looks under the hood and is smart enough to tell its a V8. If this has been addressed then again i apologize but, if it has I have not found it yet.

  10. #300
    Join Date
    Feb 2010
    Location
    North County San Diego
    Posts
    61
    Good question,

    I'm not sure about TX but in CA, you have to go see the smog referee, and if he signs off on it, re register the truck as a custom built truck with a new registration showing the changes. The catch for me is that CA only allows 500 custom cars / trucks a year. When my reg in due in Feb of next year, if I don't need a smog check, I'll hold off on the new reg paperwork and do it the next year. Just look it up on the TX DMV website and see what it says...

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