5.3 truck engine converted to 5.7 LS1

Discussion in 'High Tech Retrofits' started by ctchap70, Jul 24, 2011.

  1. Pfrederiksen

    Pfrederiksen Veteran Member

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    The 5.3, 6.0 and 5.7 all share the same rotating assembly.
    A 5.3 bored .120 over gives you an iron block ls1.
    Only difference is the 5.3 (and 4.8) came stock with cast pistons.
    Lots of guys making huge power with 5.3's because there's
    about a billion of them in the junkyards for dirt cheap.
    The truck manifold actually flows pretty decent numbers too if you can
    get past the butt ugly look of it.
    LS motors are a very stout peice of gear for a stock piece.

    P
     
  2. ctchap70

    ctchap70 Veteran Member Lifetime Gold Member

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    Well went and picked up the book mentioned earlier in post. Awesome info in it for sure! Charlton

    [​IMG]
     
  3. V8TEC

    V8TEC Veteran Member Lifetime Gold Member

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    I thought all factory GenIII/IV engines came with hypereutectic pistons, except the LS9, which has forged pistons.
     
  4. Pfrederiksen

    Pfrederiksen Veteran Member

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    You know what, I know the gen III 5.3 and 4.8 were cast, but
    that might be a truck thing. That might have changed when the gen IV
    stuff came out.
    The LS9 was a totally different animal. Forged pistons, but also
    a dry sump, supercharged beast.
    I don't think they used forged in anything else mostly due to
    noise.
     
  5. ctchap70

    ctchap70 Veteran Member Lifetime Gold Member

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    After reading the fore mentioned book, I'm thinkn no need in doing the bore thing. Cam, intake & programming can get me a pretty hot 5.3!
     
  6. ctchap70

    ctchap70 Veteran Member Lifetime Gold Member

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    Does anyone have a list of parts that will have to be gathered for a 5.3 to be installed in 2nd gen?
     
  7. DoTheDew

    DoTheDew Veteran Member

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    Read.
    Lots.
    Google.
    Lots


    Tons on info, depends on what you're looking to do. Stay efi? Swap to carbed? Different front end accessories are a must, same with motor mounts. Almost everything but the transmission must be changed, even that requires a special peice. Lots of info out there, just look for it. Its not hard, just a lot of parts and peices need to change places.

    Go back to the project progress. Lots of guys there have done it. See what they did, and what issues they had, and what they did to solve it.

    PS. You'll be more than fine with a 5.3 powerwise. Much more than any sbc that the factory put in any second gen.
     
  8. Aceshigh

    Aceshigh Veteran Member Lifetime Gold Member

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    Cost of upgrading a 5.3L vs just buying a 6.0L LY6 with the L92 heads ???

    I dunno.....
    Average going price for a 5.3L is ~$1000 and iirc that's a complete engine.
    Average going price for a 6.0L LY6 is ~$2200-$2500 for a complete engine.

    So the question is......
    What would net you the most streetable good mannered HP for the lowest price ???
    Cam & Springs swap on the LY6 = 500+HP easy and good street manners.

    The 5.3L came 270hp -305hp, and it could be made to 500hp but will be
    a bit more radical without work done. All depends on what you want in the end
    and what you're willing to spend to get it there determines the best engine for you.
     
    Last edited: Jul 27, 2011
  9. Aceshigh

    Aceshigh Veteran Member Lifetime Gold Member

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    I'm too lazy to look it up because I'm bailin but.....

    I don't know if the LS1 5.7L shares the same heads and valvetrain as the 5.3L variants.
    So it might not just be bore and cam.
     
  10. ctchap70

    ctchap70 Veteran Member Lifetime Gold Member

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    Aces, the book I mentioned earlier shows dyno results for just adding a LS6 cam, catback exhaust, cold air intake & some tuning to achieve 352 hp and 346 trq. That's why I said that the boring of the cylinders might not be in the picture. You are very right, I would rather have a 6.0 anytime but I was talking about working with what I have on hand to work with. Selling the truck will still be a option also to buy whatever engine I want. But, how do I know how the bought engine was serviced? Transmission? I know the service record of the one in my truck. Thanks for ur input though. Thank everyone. Charlton
     

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