LY6 vs LS3 differences??

Discussion in 'High Tech Retrofits' started by Aceshigh, Nov 30, 2010.

  1. Aceshigh

    Aceshigh Veteran Member Lifetime Gold Member

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    GM LS3 with the Hot Cam which boosts HP another 50hp. :)
    The LS3 cam specs are intake - 0.551" @ 204, exhaust - 0.525 @ 211.
    The Hot Cam specs are intake - 0.525 @ 219, exhaust - 0.525 @ 228, 112 LSA

    Cheapest I could find it is ~$6700, now that's a great deal. No doubt.
    However I've done the comparison, and here's the rub from a budget
    perspective comparing to a salvage say LY6 or L92 pull.

    1. Purchase ECM flat out = 2x the cost of modding one & most aftermarket one's are locked.
    2. Purchase harness flat out, 2-3x the cost of modding one from Speartech.
    3. No sensors included, MAF ($250ish), O2 Sensors, etc.
    4. $3,700 more then the average L92 pull.
    5. $4,500 more then the average LY6 pull.

    Break even points

    1. All accessories have to be purchased.
    2. Manifolds most likely swapped to headers
    3. Same L92 heads.
    4. Swap oil pan = $400 new , or ~$200 used + windage tray & pickup.

    Pro's.

    1. Already has LS3 intake, injectors, fuel rail. = $300+ saved used
    2. Already has cam & springs done = $500-$1000 saved.
    3. Engine is brand new VS used and a gamble.

    IF .....I had that kind of cash laying around I'd be right by ya doing it.
    BUT.....I did one already and it soaked me pretty good for close to $10,000.....
    Labor, parts, engine ......back then LS1 / 4L60e combo's were going for $6k used. :rolleyes:
    I got mine for $4500 on a sweet deal (only 26K) , but lost my ass on labor and parts.:screwup:

    The downside is now the engine salvage yards are trying to give you just the
    engine instead of the ENTIRE drivetrain pull......trans, harness, ECM.
    So you have to scour for the complete pulls to save the most cash.
     
    Last edited: Dec 1, 2010
  2. fabio

    fabio Veteran Member

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    I just picked up a complete 6.0 from a 2002 truck with 317 heads. Is this thing called anything like LY6 etc?
     
  3. JAMMINJ007

    JAMMINJ007 Veteran Member

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    Nope probably LQ4 still a good motor though.
     
  4. 71RS/SS396

    71RS/SS396 Veteran Member

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    The other possible drawback to buying the crate and gm controller is that you have to buy a separate controller for the trans, at least with the e-rod I know that's the case and I'd assume the other crate packages as well. Gm wants to sell you that $1000 controller and harness on top of the engine and ecm to run your 4L60e.
     
  5. V8TEC

    V8TEC Veteran Member Lifetime Gold Member

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    Ace -

    Pace Performance has the LS3 for $6260:
    http://paceperformance.com/i-5135821-19244097-ls3-6-2l-gen-iv-engine.html

    Crate Engine Depot has it for $6135:
    http://www.crateenginedepot.com/store/LS3-62L-CrateEngine-19244097-P1897C509.aspx

    SMC Performance HAD the Holden L98 6.0L engines, brand new in crate for $4800, but they sold out. Basically an LS2 with L92 heads and an L76 car intake. No wonder they sold out...that was a great deal. I'm pissed that I didn't buy one...I have to get out of my procrastination funk.

    Good luck.
     
  6. JAMMINJ007

    JAMMINJ007 Veteran Member

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    Well if I remember correctly 2007 and up motors use both an ecm and tcm.

    You guys should of bought the crate motors that Jake was selling. He had complete LY6 crates for $2800 which was one hell of a deal. I got mine just before he sold out.
     
  7. Lrader99

    Lrader99 Veteran Member Lifetime Gold Member

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    LY6 cant have both VVT and L92 heads its an either or. if it has VVT its using the L99 heads which is what the 5th gen automatic camaros have. everything else is the same on VVT motors except the cam heads and computer.

    The reason there are minimal gains in porting an LS3 head is that from the factory LS3 heads flow right at 320 CFM. Which is similar to BBC numbers and full race SBC heads. So it comes down to choosing a cam that puts you in the rpm range you want. Also L92 heads require a minimum of a 4.000" bore, they are not a direct bolt on for a Gen III LSx as the factory bore is 3.898", there are some people that have put smaller valves into the L92 heads to use them on a standard bore Gen III but thats like buying a vette and sticking a V6 in it for better fuel economy.
     
  8. Todd80Z28

    Todd80Z28 Moderator Staff Member Lifetime Gold Member

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    Ace- GM's engine controller setup, which includes ECM, harness, sensors and pedal for the DBW throttle body is about $900. They have it for both the base LS3 and the 480.

    EDIT- for the 480- http://www.shopfbparts.com/servlet/Detail?no=216
     
    Last edited: Dec 1, 2010
  9. JAMMINJ007

    JAMMINJ007 Veteran Member

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    Really? Might want to check again!! MIne did. Good ole 823 casting.
     
    Last edited: Dec 1, 2010
  10. Lrader99

    Lrader99 Veteran Member Lifetime Gold Member

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    yours did what? your LY6 has L92 heads and VVT? must not be the same setup that they are using on the newer stuff... ohwell we can all be wrong every once in a while
     

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