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Thread: My 1999 OBS C1500 LQ9 6.0 LS Swap

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  1. #1
    Truck has been running for about a month now! Haven't had much time behind the wheel due to being busy with work but I have some more pics and a video.

    Modified the water temp sending unit to fit the LS head.




    34" Radiator with 05' and up Electric Fans



  2. #2
    Here's a quick video of it idling. Excuse the wires, this was like 5 minutes after the first start up! I still have a lot of cleaning up to do with the wiring and all. Im currently working on the exhaust myself. Bought some 3" mandrel bends and I've been slowly getting that done. This video is open headers..


  3. #3
    Join Date
    Dec 2004
    Location
    San Antonio, TX Area
    Posts
    1,741
    Truck sounds awesome. You do good work. I like the mod for the trans cooler. What method did you use for the water temp sending unit? The grinder or the lathe? What size tap did you use?
    Quote Originally Posted by ChevyMan90 View Post
    Modified the water temp sending unit to fit the LS head.
    "ALisSa1 Silverado"
    1990 Chevrolet RCSB 2002 Chevrolet Camaro LS1/4L60E
    Scrimpin Ain't Easy
    ( . Y . )


  4. #4
    Thanks man! For the water temp sending unit I used a lathe to turn it down. The new threads to fit the LS head are an M12 x 1.5. Some people drill and tap the head to make the sensor fit but couldn't see doing that on a brand new set of heads.

  5. #5
    Join Date
    Aug 2012
    Location
    Portland, OR
    Posts
    81
    That sounds soooo good! What did you do for the throttle cable bracket? Fabbed one up?

  6. #6
    Thanks! Yea I modified the 99-02 throttle cable bracket and welded another piece to it so that I could get 2 bolts holding it down.

  7. #7
    Join Date
    Aug 2012
    Location
    Portland, OR
    Posts
    81
    Ok cool, I was considering doing the same thing. Thanks for the info!

  8. #8
    Join Date
    Jul 2008
    Location
    San Antonio
    Posts
    43
    Thanks for sharing! This is exactly what I want to do with my '96 when funds and time allows!
    1996 GMC Sierra RCSB
    4.3L V6 - 4L60E - 15" stock aluminums - 3.42s - slow weekend warrior
    2004 Chevy Tahoe LT
    5.3L V8 - 4L60E - 17" stock aluminums - 3.73s - less slow daily driver

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