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Thread: 2001 lq4 into 2005 rcsb

  1. #11
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    The engine is a legal swap, it's the PCM controlling it that will need to be upgraded to at least a 2005 model. That will probably require swapping the intake setup to a DBW throttle body.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  2. #12
    DBYRD Guest
    thats interesting ive never heard u must have the same year pcm as the truck. i guess i wouldnt care cuz i dont live in a strict area for that kinda stuff.

  3. #13
    Join Date
    Jun 2006
    Posts
    321
    Quote Originally Posted by DBYRD View Post
    thats interesting ive never heard u must have the same year pcm as the truck. i guess i wouldnt care cuz i dont live in a strict area for that kinda stuff.


    ya thats why i asked if there was a law against that.... no big guess ill just do the dbw setup swap.... cant wait for the v8!!!
    05 Chevy Silverado. Regular cab, short bed.
    -4.3L
    - Sung Top tonneau bed cover.
    imco custom dual exhaust,
    custom air intake,
    ls1 build in progress..

  4. #14
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Your best thing to do would be to call the referee station in Irving and ask them what you can do and still get it inspected. My 92 with 93 LT1 engine would not pass the sniffer test and they sent me there for final testing. They gave me a free pass for that year since I spent $300 trying to get it to pass. Contact your local inspection station for the number if you can't find the number in the phone book.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  5. #15
    Join Date
    Jun 2006
    Posts
    321
    ok sounds good... why wouldnt it pass the sniffer... dosnt seem like a diffrent ngine other than what the truck comes with would cause it to do that... was it because it was obd 1?
    05 Chevy Silverado. Regular cab, short bed.
    -4.3L
    - Sung Top tonneau bed cover.
    imco custom dual exhaust,
    custom air intake,
    ls1 build in progress..

  6. #16
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Mine didn't pass the sniffer because the cat was blown out. I found that out later. I'd never heard of a cat disintigrating before. I was changing the exhaust system to a new configuration and noticed the cat was totally hollow.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  7. #17
    Join Date
    Jun 2006
    Posts
    321
    dang that blows..... 300 bucks because of a blown cat... dang haha
    05 Chevy Silverado. Regular cab, short bed.
    -4.3L
    - Sung Top tonneau bed cover.
    imco custom dual exhaust,
    custom air intake,
    ls1 build in progress..

  8. #18
    Join Date
    Mar 2006
    Location
    Phoenix, AZ
    Posts
    620
    Ok so in your case, the year of the engine doesn't make any difference, but the PCM, wiring harness, and throttle body type will. If you plan on going with a DBW setup, you'll have to get the correct throttle body, PCM, and harness, and you'll have to go to a DBW gas pedal and TAC module. The other issue to consider is whether or not you'll be able to get cruise control to work. I think there's some cruise components that have to be changed too. The 03+ V6 trucks are a PITA because the V8's are electronic throttle control, whereas the V6's are still cable.


    2006 GTO M6 Brazen Orange
    2006 Silverado CCSB Duramax


  9. #19
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    its much easier to buy a v8 truck and just swap to the 6L. That would be my suggestion. Put your truck back to stock and then trade it off for a V8 and then put the 6L in it. The 6L long block will be compatible with emission regulations for TX that way.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  10. #20
    Join Date
    Jun 2006
    Posts
    321
    Quote Originally Posted by RedHeartbeat View Post
    its much easier to buy a v8 truck and just swap to the 6L. That would be my suggestion. Put your truck back to stock and then trade it off for a V8 and then put the 6L in it. The 6L long block will be compatible with emission regulations for TX that way.
    would if i could... but i cant...
    05 Chevy Silverado. Regular cab, short bed.
    -4.3L
    - Sung Top tonneau bed cover.
    imco custom dual exhaust,
    custom air intake,
    ls1 build in progress..

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