LS2 vs. L76.
Thread Starter
On The Tree
Joined: Mar 2010
Posts: 108
Likes: 0
From: Amarillo, Texas
LS2 vs. L76. Does anyone know the exact differences between the LS2 and L76?
The L76 is the motor in the G8 GT.
I believe both use the LS2 block but the L76 has completely different heads and a very tiny cam.
Anyone know more?
The L76 is the motor in the G8 GT.
I believe both use the LS2 block but the L76 has completely different heads and a very tiny cam.
Anyone know more?
TECH Enthusiast
Joined: Jan 2010
Posts: 578
Likes: 4
From: REALITY
LS2 catherdral port heads 243's
L76 rec port heads L92's type
LS2 no DOD,AFM,VVT
L76 VVT,some have DOD, and were replaced with AFM
The DOD and AFM most guys do not want to deal with cyclinders being shut of for gas mileage in an performance application.....
This was enough right here to make me say fugg a L76, I would go LQ9,LS2,LS3, LSX376, LSX454, etc.... 6.0+
L76 rec port heads L92's type
LS2 no DOD,AFM,VVT
L76 VVT,some have DOD, and were replaced with AFM
The DOD and AFM most guys do not want to deal with cyclinders being shut of for gas mileage in an performance application.....
Active Fuel Management (formerly known as Displacement on Demand) is a trademarked name for the automobile variable displacement technology from General Motors. It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy. Estimated performance on EPA tests show a 5.5%-7.5% improvement in fuel economy.[1]
GM's current Active Fuel Management technology uses a solenoid to deactivate the lifters on selected cylinders of a pushrod V-layout engine.
GM's current Active Fuel Management technology uses a solenoid to deactivate the lifters on selected cylinders of a pushrod V-layout engine.
11 Second Club
Joined: Mar 2009
Posts: 205
Likes: 0
From: MD
All you have to do is pull the cam, lifters, and springs and you'll have a nice running engine.
My L76 makes 426hp with a mild cam and pushes my 4000 lb turd down
the 1/4 at 11.81@117
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No.... the L76 has the same exact L92 heads with the same standard size valves and the block is the same, with exeption to the oiling of the dod system thats built in to the valley cover, which can be plugged if your deleting the dod feature during a non-dod cam swap like i done to my G8.
Both have a 4.00 bore. L76 uses a smaller valve than the L92. Block would have to be different for the AFM. I would think the L76 head would be a better choice then the l92 for the 4.000-4.030 bore guys.
No. The L76 was the 4.000 bore. The L92/LS3/LS9/LSA use a 4.065 bore. They all use the same stroke.
Staging Lane
Joined: Mar 2005
Posts: 81
Likes: 0
From: Baton Rouge
L76 is basiclly an LS2 with L92 heads and LS3 intake
dod/afm drops out fuel and spark to 4 cylinders in dod/afm mode
doing a complete dod delete (electronically and mechanically )
will make for a good motor
and with a nice cam can make + 500 hp
doing a L76/6L80E drop into a 52 chevy fleetline
hope to make 500-525 hp on a chassis dyno when done
steve
dod/afm drops out fuel and spark to 4 cylinders in dod/afm mode
doing a complete dod delete (electronically and mechanically )
will make for a good motor
and with a nice cam can make + 500 hp
doing a L76/6L80E drop into a 52 chevy fleetline
hope to make 500-525 hp on a chassis dyno when done
steve
Teching In
Joined: Aug 2014
Posts: 2
Likes: 0
Help with modified L76 build I was given a L76 short block. I have a set of 243 heads for this. I am going to delete DOD and the VVT. I need help on picking rods, pistons, and a cam profile. I would like to get as close to 500 hp as possible if that is possible?thanks for your help
Registered User
Joined: Sep 2015
Posts: 1
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L76 6l80 swap L76 is basiclly an LS2 with L92 heads and LS3 intake
dod/afm drops out fuel and spark to 4 cylinders in dod/afm mode
doing a complete dod delete (electronically and mechanically )
will make for a good motor
and with a nice cam can make + 500 hp
doing a L76/6L80E drop into a 52 chevy fleetline
hope to make 500-525 hp on a chassis dyno when done
steve
dod/afm drops out fuel and spark to 4 cylinders in dod/afm mode
doing a complete dod delete (electronically and mechanically )
will make for a good motor
and with a nice cam can make + 500 hp
doing a L76/6L80E drop into a 52 chevy fleetline
hope to make 500-525 hp on a chassis dyno when done
steve
L76 is basiclly an LS2 with L92 heads and LS3 intake
dod/afm drops out fuel and spark to 4 cylinders in dod/afm mode
doing a complete dod delete (electronically and mechanically )
will make for a good motor
and with a nice cam can make + 500 hp
doing a L76/6L80E drop into a 52 chevy fleetline
hope to make 500-525 hp on a chassis dyno when done
steve
dod/afm drops out fuel and spark to 4 cylinders in dod/afm mode
doing a complete dod delete (electronically and mechanically )
will make for a good motor
and with a nice cam can make + 500 hp
doing a L76/6L80E drop into a 52 chevy fleetline
hope to make 500-525 hp on a chassis dyno when done
steve
The L76 is a 6.0L engine (same as LS2) with the L92 heads as stated previously. The only difference I'll add is the LS3 and L76 intake is different with different GM part numbers. The L76 intake is the same as the LS2 GTO intake with the same accessory ports, etc as the GTO LS2 intake. The LS3 intake has a different part number and my understanding is it has a different IMP connection design and different vacuum ports although I have not compared them directly. The L76 intake is a plug and play intake for the a GTO running L92/LS3 heads. Externally the LS2 vs. L76 intake are identical except the intake port shapes.
Teching In
Joined: Sep 2016
Posts: 2
Likes: 0
L76 uses the L92 heads, a AFM cam, and the LS3 intake. A signal from the ECM [that signal comes from throttle position and speed] determines when the AFM turns on or off. The lifters in 4 cylinders will then turn off or on. The lifters are activated by oil pressure. That's why the G8 holds 8.8 quarts of oil.
All you have to do is pull the cam, lifters, and springs and you'll have a nice running engine.
My L76 makes 426hp with a mild cam and pushes my 4000 lb turd down
the 1/4 at 11.81@117
All you have to do is pull the cam, lifters, and springs and you'll have a nice running engine.
My L76 makes 426hp with a mild cam and pushes my 4000 lb turd down
the 1/4 at 11.81@117
