L76 Engine Parts -- Pics and Info

[HSV-GTS-300]

http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/0820L7620G8-1.jpg

[HSV-GTS-300]

2007 Style L76 90mm intake manifold, fitted to L92 heads.
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/100_2848.jpg

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.
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/L9220vs20LS320intakes.jpg

LS3 intake manifold
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/LS320intake20cover20underside.jpg

LS3 intake manifold
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/LS320MAP20sensor20close20up.jpg

LS3 intake manifold
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/112_0709_07zLS3_intake_manifold.jpg

[HSV-GTS-300]

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.
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/0702gm_02_zls2_engine.jpg

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

Comparison LS7 intake ports v L76/L92 intake ports
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/LS7vL92.jpg

L76/L92 Port Cross-section
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/L92_head_cross_section.jpg

L76/L92 Stock chamber volume 70cc
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/stockl92.jpg

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

Pair of L76/L92 heads
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/L92HEADS.jpg

[HSV-GTS-300]

L76/L92 Cylinder Head Information.
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/12582713.jpg
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/12582713a.jpg
** 0.510" Max valve lift due to Stock valve springs 12589774 (rated to 0.530")

Stock L76/L92 Head Flow Data
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/L76-L92headflowdata.jpg

Compare with LS2 Head Flow Data
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/LS2headflowdata-a.jpg

GMPP CNC L76/L92 Head Flow Data
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/CNCL92headflowdata.jpg

[HSV-GTS-300]

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"
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/634_18.jpg

http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/112_0709_09zLS3_LS2_rocker_arms.jpg

L76/L92 Intake Rocker
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/634_35.jpg

L76/L92 Exhaust Rocker (Normal Type) on the Left #10214664
L76/L92 Intake Rocker (Offset) on the Right #12569167
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/ccrp_0705_04_ztesting_GM_L92_and-1.jpg

[HSV-GTS-300]

Rear view of L76 car engine
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/P1010139.jpg

Block Casting Number 12568952 (Same as LS2)
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/P1010171.jpg

Harness Connector for the Lifter Oil Manifold assembly (LOMA)
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/P1010138.jpg

Side View
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/P1010144.jpg

Very short EV6 style injectors #12576341 39lb/hr (Same as LS7)
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/P1010146.jpg

http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/P1010149.jpg

[HSV-GTS-300]

Heads and Intake removed.
Lifter Oil Manifold Assembly (LOMA) in the valley.
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/ToplessL76.jpg

[HSV-GTS-300]

Single bolt cam core.
No cam phaser fitted (Unlike the L76 Vortec truck engine with VVT)
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/100_0770.jpg


Car L76 does not have this Cam Phaser
http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/GMC2005092041845_PV.jpg


http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/12591689.jpg

[jmd]

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.

[59rat]

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

[HSV-GTS-300]

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)

[HSV-GTS-300]

This may help with finding the right bits.
I just measured the bolts off my L76 intake.

http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/P1010528-copy_02.jpg

[59rat]

THANKS. I tried gmpartsdirect.com but with out part # didn't get any where. Rod

[HSV-GTS-300]

Lifter Oil Manifold Assembly

http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/2008_0617Cars0001.jpg

http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/2009_0411Cars0020.jpg


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

http://i2.photobucket.com/albums/y20/PerthPurplePenguin/car%20parts/L76/2008_0617Cars0010.jpg