+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 10 of 14

Thread: 4.8L to a LS1

  1. #1

    4.8L to a LS1

    What do i need to do? I found a motor, do i need the wiring harness as well
    Dropped Ext Cab 99 Sierra, AirRaid intake, PowerAid Throttle Body Spacer, 3 in exhaust to a Flowmaster, Exhaust out back side of bed of truck, Bright Red, Projector Headlights, Billet Steering Wheel, Touch Screen DVD/CD player, Soon To have, N2O, Headers, Cam, Stall, Nelson Tune, E fans, Shift Kit,

  2. #2
    Join Date
    Mar 2003
    Location
    San Marcos Texas
    Posts
    4,393
    Just bolt it in there. Use all your 4.8l parts and bolt them onto the LS1 with your existing harness.
    2006 Superior Blue Trailblazer SS AWD, Stock as a rock

    Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).

    Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning

  3. #3
    Your wiring harness should work fine. You will need a tune and maybe some misc stuff to hook up fuel lines etc. Someone correct me if I am wrong.
    99RCSB Broke because I wasted thousands and thousands of dollars on my truck.

  4. #4
    Join Date
    Mar 2003
    Location
    San Marcos Texas
    Posts
    4,393
    A tune will make the most of your new power. I drove mine with the 4.8 tune for a good while before I got it tuned for the 5.7. Fuel lines will hook up the same as now if you use your truck intake off your 4.8.
    2006 Superior Blue Trailblazer SS AWD, Stock as a rock

    Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).

    Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning

  5. #5
    Join Date
    Sep 2007
    Location
    Texas
    Posts
    5,301
    i wish mine was that easy

  6. #6
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    If you just use the longblock and not accessories it will swap straight over. I'm thinking you'll need some bigger injectors, maybe not. The tune will definitely have to be updated. You'll have to swap out all accessories and the crankshaft pulley. You'll probably have to swap valve covers, PCV tubing and coil packs, too. Be sure to see that they oil pressure sender is the same as yours or just swap them.
    Last edited by RedHeartbeat; 12-09-2007 at 12:24 PM.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  7. #7
    you think ill notcie i good power gain????
    Dropped Ext Cab 99 Sierra, AirRaid intake, PowerAid Throttle Body Spacer, 3 in exhaust to a Flowmaster, Exhaust out back side of bed of truck, Bright Red, Projector Headlights, Billet Steering Wheel, Touch Screen DVD/CD player, Soon To have, N2O, Headers, Cam, Stall, Nelson Tune, E fans, Shift Kit,

  8. #8
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    oh yeah! The engine is supposed to be about 345 hp but with headers Popular Hotrodding dyno'd one and it put out more than 400 at the crank.
    Last edited by RedHeartbeat; 12-09-2007 at 01:17 PM.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  9. #9
    then yes i will do it, probably do a cam and stall with a shot
    Dropped Ext Cab 99 Sierra, AirRaid intake, PowerAid Throttle Body Spacer, 3 in exhaust to a Flowmaster, Exhaust out back side of bed of truck, Bright Red, Projector Headlights, Billet Steering Wheel, Touch Screen DVD/CD player, Soon To have, N2O, Headers, Cam, Stall, Nelson Tune, E fans, Shift Kit,

  10. #10
    Join Date
    Dec 2007
    Location
    Your Moms House
    Posts
    645
    ill be right behind u lol ima do that 5.7 if its that ez

+ Reply to Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts