Results 1 to 14 of 14

Thread: L76 Engine Parts -- Pics and Info

  1. #1
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500

    L76 Engine Parts -- Pics and Info


  2. #2
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500
    2007 Style L76 90mm intake manifold, fitted to L92 heads.


    New for 2008 the L76 car engine gets the LS3 intake manifold.
    Changes include MAF sensor is now bolted down and an additional removeable noise/beauty cover is fitted.

    2007 L76 intake on the left, 2008 L76 intake (LS3) on the right.


    LS3 intake manifold


    LS3 intake manifold


    LS3 intake manifold
    Last edited by HSV-GTS-300; 04-02-2008 at 12:13 AM.

  3. #3
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500
    CYLINDER HEADS
    The L76 car engine is fitted with L92 cylinder heads.

    L76/L92 head with rectangular intake ports on the left.
    LS1/LS2/LS6 style cathedral intake port head on the right.


    L76/L92 rectangular ports measure approximately 1.25" W x 2.5" H

    Comparison LS7 intake ports v L76/L92 intake ports


    L76/L92 Port Cross-section


    L76/L92 Stock chamber volume 70cc


    Exhaust Valve = 1.59" dia...........Intake Valve = 2.16" dia

    Pair of L76/L92 heads
    Last edited by HSV-GTS-300; 04-02-2008 at 01:26 AM.

  4. #4
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500
    L76/L92 Cylinder Head Information.


    ** 0.510" Max valve lift due to Stock valve springs 12589774 (rated to 0.530")

    Stock L76/L92 Head Flow Data


    Compare with LS2 Head Flow Data


    GMPP CNC L76/L92 Head Flow Data
    Last edited by HSV-GTS-300; 04-02-2008 at 07:42 AM.

  5. #5
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500
    Creating the larger intake ports and maintaing the 15 deg valve angle has resulted in the L76/L92 head using offset intake rockers.
    The offset distance ( between valve tip and pushrod centrelines) is about 6mm or 0.250"




    L76/L92 Intake Rocker


    L76/L92 Exhaust Rocker (Normal Type) on the Left #10214664
    L76/L92 Intake Rocker (Offset) on the Right #12569167
    Last edited by HSV-GTS-300; 04-06-2008 at 11:05 AM.

  6. #6
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500
    Rear view of L76 car engine


    Block Casting Number 12568952 (Same as LS2)


    Harness Connector for the Lifter Oil Manifold assembly (LOMA)


    Side View


    Very short EV6 style injectors #12576341 39lb/hr (Same as LS7)



  7. #7
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500
    Heads and Intake removed.
    Lifter Oil Manifold Assembly (LOMA) in the valley.

  8. #8
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500
    Single bolt cam core.
    No cam phaser fitted (Unlike the L76 Vortec truck engine with VVT)



    Car L76 does not have this Cam Phaser




  9. #9
    moats & toes
    jmd's Avatar

    Join Date
    Feb 2004
    Location
    God Hates Fags Preschool
    Posts
    42,544
    vCash
    500
    I don't keep up with the latest and greatest on these engines. But I feel as if no matter how annoying all the swap complications (changing reluctors every few yers) become, it's still awesome how they are still constantly seeking improvement.

    The engines with which I am most familiar and drive myself were vastly unchanged for decades, minus changes here and there. The LS2 lasted all of 3 years before a successor arrived. It's great.

  10. #10
    Registered Member

    Join Date
    Aug 2007
    Location
    Port Saint Lucie
    Posts
    16
    vCash
    500

    L76 INTAKE

    I just bought a L76 intake fuel rails & TB for my LS2 with L92 heads. Would you know the part numbers for the intake bolts, fuel rails & tb? Thnaks Rod

  11. #11
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500
    Part #12590124 L76 / L92 Car Bare Intake Manifold

    Note: Bolts for attaching the intake manifold are the same bolts as used on the LS1 and LS6 intake manifolds, part number 12552344 - requires 10-pieces.


    LS2 throttle body attachment fastener x 4required = 11519971 each

    LS2 fuel rail attachment bolt x4required = 12590276 each
    (this number may have been superceded, I can't find the new number)

  12. #12
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500
    This may help with finding the right bits.
    I just measured the bolts off my L76 intake.


  13. #13
    Registered Member

    Join Date
    Aug 2007
    Location
    Port Saint Lucie
    Posts
    16
    vCash
    500
    THANKS. I tried gmpartsdirect.com but with out part # didn't get any where. Rod

  14. #14
    Marsupial
    HSV-GTS-300's Avatar

    Join Date
    Apr 2004
    Location
    Perth Australia
    Posts
    16,212
    vCash
    500
    Lifter Oil Manifold Assembly






    L76 is fitted with 4 x Collapsible (DOD) lifters & 4 normal LS type lifters on each bank of cylinders.


Posting Permissions

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