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Thread: Help!!!!!!!!!!! 4.8l - 5.3l

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  1. #1
    Join Date
    Nov 2007
    Location
    S.A. Texas
    Posts
    3,751
    its on the front of the block its cast into it. Like this.
    Your machine shop is retarded. 4.8/5.3 is the same blocks, same bore, just different crank.
    Name: Mark,
    God created turbo lag so nitrous trucks could have a chance.


    http://www.ls1truck.com/forums/my-ga...tml#post274877

  2. #2
    Join Date
    Feb 2010
    Location
    North County San Diego
    Posts
    61
    How much of a hit in performance will I take? My receipt says 5.3L not 4.8 so I have a valid reason to take it back. If I change the crank will it be equal to a 5.3? Is it worth the flight to take a back and get my money back?

  3. #3
    Join Date
    Nov 2007
    Location
    S.A. Texas
    Posts
    3,751
    if this was just a rebuild not much. The 4.8 and 5.3 only had 15hp difference between them. My 4.8 made 450hp/450 tq on 10psi. Depends on how much performance you were looking for.
    Name: Mark,
    God created turbo lag so nitrous trucks could have a chance.


    http://www.ls1truck.com/forums/my-ga...tml#post274877

  4. #4
    Join Date
    Sep 2007
    Location
    Broken Bow, OK
    Posts
    1,434
    What did the pistons you took out look like?

  5. #5
    Join Date
    Feb 2010
    Location
    North County San Diego
    Posts
    61
    Bad call by the machine shop. The crank and pistons are for a 5.3L so all is good. I'm glad I had a chance to write you guys and look online, or I would have call the wrecking yard and looked like a ass!

    Thanks guys for th quick help

    Carnell

  6. #6
    Join Date
    May 2009
    Location
    hot & windy
    Posts
    1,117
    easiest way to tell with the heads off is if the pistons are flat-tops or not. 4.8 has flat; 5.3 has dished (except the L33 - it had flats too, but was an aluminum block)
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

  7. #7
    Join Date
    Feb 2010
    Location
    North County San Diego
    Posts
    61
    I read that last night. I'm glad I took allot of pictures during the tear down
    Attached Images

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