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L92 Heads/Info and Owners In Here

619K views 4K replies 247 participants last post by  twistedneck 
#1 · (Edited)
Always a lot of talk so I have comprised a list of all the owners with L92 heads and a stock bottom end. I have also done my best to obtain cam specs and track times.

See the redone list below in post #7.

If I missed anyone please let me know as well as if I stated something incorrectly.

Also if any of you can fill in the places where there are ??? that would be great.
 
#2 ·
Damn that didn't show up on the screen like I thought it would.
 
#3 ·
Can someone put this in some sort of sheet that is easy to read?
 
#5 ·
LMAO get outa my thread:turbonaug
 
#6 ·
Good idea, thanks for going to all that effort. Maybe make the seperation bold for ease of reading, like this...

transformer goat//432/391//A4//230/240 114//12.9@110

ps New numbers and times in the spring:turbonaug
 
#7 · (Edited)
Official L92/L76 and LS3 Heads/Intake FAQ and Information


- L92/L76 and LS3 FAQ.

Q. What are the differences between L92/LS3 and LS2 style heads?
A. The L92/LS3 heads have larger relocated valves, larger rectangular intake ports (as opposed to the LS2's cathedral port), as well as increased intake and exhaust flow.













Q. What are the differences between L92 and LS3 heads?
A. LS3 heads ship with lighter valves and better valvesprings than standard L92 heads. Everything else is identical.

Q. What headgaskets can I use with L92/LS3 heads?
A. You CAN NOT use LS2 headgakets. You need a 4.060 bore headgasket which is OEM equipment on all vehicles with L92 heads or LS3 heads (see below). Many aftermarket manufacturers offer 4.060 head gaskets in different thicknesses to raise or lower compression.

Q. What are the differences between L76 and LS3 intake?
A. L92 and LS3 intake manifolds share the same castings and can be used interchangeably. Although the LS3 also has an external "beauty" cover, the most noteable difference in the manifolds themselves is the MAP sensor.

The L76 manifold uses an LS2 MAP sensor with a clip style mount.
The LS3 manifold uses a slightly larger MAP sensor (p/n: 88988583) that is bolted down.

Q. Where can I find L92/L76 or LS3 heads and intake?
A. The L92 Heads are OEM equipment on

- 2007+ Cadillac Escalade
- 2008+ Chevrolet Tahoe
- 2007+ GMC Yukon Denali/Denali XL
- 2007+ GMC Sierra Denali
- 2008+ Hummer H2
- 2009+ Chevrolet Silverado 1500
- 2008-2009 Pontiac G8 GT

The L76 Intake is OEM equipment on

- 2008-2009 Pontiac G8 GT

The LS3 Heads & Intake are OEM equipment on

- 2008-present Chevrolet Corvette
- 2009 Pontiac G8 GXP
- 2010 Chevrolet Camaro

Q. Which engines will the L92/L76 or LS3 Heads/Intake fit?
A. Any GM GEN-IV engine with a 4.000 bore or larger.

Q. With the L92/L76 or LS3 what are my options for...

- Rockers
- Springs
- Fuel Rails
- Injectors

Q. What do I need for a L92/L76 or LS3 swap on my car?



- L92/L76 and LS3 Tips and Information.

- Compression Ratio
- Flycutting




- Dyno Numbers of L92/L76 and LS3 Heads/Intake GTO's with stock displacement.

These cars are all 364 CID, and dyno numbers should be SAE to keep with the standard.

I have ordered them decending from the highest horsepower. If your information below needs updated, or you would like to be added to the list - please PM me or post up.

Thanks to PBANDPKGTO for gathering all the data.

Code:
[B]Screen Name	RWHP/RWTQ	Transmission	Camshaft		Portwork	ET @ MPH[/B]
				
PhillyGoat	486/435		M6		232/238 .595/.605 114	Heads|Intake
Johnehale2003	485/439		M6		231/234 .643/.598 111	Intake		11.88@116mph
SAjenkins24	479/430		M6		232/236 .600/.600 113	
kanibal		477/462		A4		224/230 .581/.581 114 	Heads
Tims05		476/416		A4		Cartek Custom		Heads|Intake	11.55@117mph
BeachGoat       475/425         M6              224/230 .581/.591 114   Heads|Intake    12.49@113mph
gnfan           469/420         A4              227/235 .614/.620 114   Intake
goatryder08	468/439		M6		216/229 .561/.562 113	Intake	
ArthurJGuy	461/421		M6		234/245 .64x/.60x 111	Heads|Intake	
DaGoat6Litre	459/436		M6		222/224 .566/.568 112	
skyfz_450	458/430		M6		228/240 .610/.612 115	
G_Loc		458/422		M6		225/230 .617/.613 112	Intake
Badimpala	458/421		M6		227/239 .614/.624	Heads|Intake
KC2GIW		456/427		M6		228/240 .610/.612 115	Heads		12.90@117mph
Stevo		452/419		M6		224/240 .588/.591			12.40@110mph
TOCgoat		452/412		M6		228/244 .615/.615 115	Heads		
PBANDPKGTO	451/403		A4		232/236 .600/.600 113	Intake		11.22@120mph
CDRUM1		450/400		M6		228/230 .588/.591	
Badimpala	446/404		M6		228/240 .611/.610	Heads|Intake
Bambam		438/403		M6		232/236 .600/.600 113	
ShoddyHog	438/405		M6		228/232 .612/.600 111	Heads|Intake
TKO52		426/391		M6		242/242 .610/.610	
Scottward	415/407		M6		Stock LS2		Intake
 

Attachments

#562 ·
Official L92/L76 and LS3 Heads/Intake FAQ and Information


- L92/L76 and LS3 FAQ.

Q. What are the differences between L92/LS3 and LS2 style heads?
A. The L92/LS3 heads have larger relocated valves, larger rectangular intake ports (as opposed to the LS2's cathedral port), as well as increased intake and exhaust flow.













Q. What are the differences between L92 and LS3 heads?
A. LS3 heads ship with lighter valves and better valvesprings than standard L92 heads. Everything else is identical.

Q. What headgaskets can I use with L92/LS3 heads?
A. You CAN NOT use LS2 headgakets. You need a 4.060 bore headgasket which is OEM equipment on all vehicles with L92 heads or LS3 heads (see below). Many aftermarket manufacturers offer 4.060 head gaskets in different thicknesses to raise or lower compression.

Q. What are the differences between L76 and LS3 intake?
A. L92 and LS3 intake manifolds share the same castings and can be used interchangeably. Although the LS3 also has an external "beauty" cover, the most noteable difference in the manifolds themselves is the MAP sensor.

The L76 manifold uses an LS2 MAP sensor with a clip style mount.
The LS3 manifold uses a slightly larger MAP sensor (p/n: 88988583) that is bolted down.

Q. Where can I find L92/L76 or LS3 heads and intake?
A. The L92 Heads are OEM equipment on

- 2007+ Cadillac Escalade
- 2008+ Chevrolet Tahoe
- 2007+ GMC Yukon Denali/Denali XL
- 2007+ GMC Sierra Denali
- 2008+ Hummer H2
- 2009+ Chevrolet Silverado 1500
- 2008-2009 Pontiac G8 GT

The L76 Intake is OEM equipment on

- 2008-2009 Pontiac G8 GT

The LS3 Heads & Intake are OEM equipment on

- 2008-present Chevrolet Corvette
- 2009 Pontiac G8 GXP
- 2010 Chevrolet Camaro

Q. Which engines will the L92/L76 or LS3 Heads/Intake fit?
A. Any GM GEN-IV engine with a 4.000 bore or larger.

Q. With the L92/L76 or LS3 what are my options for...

- Rockers
- Springs
- Fuel Rails
- Injectors

Q. What do I need for a L92/L76 or LS3 swap on my car?



- L92/L76 and LS3 Tips and Information.

- Compression Ratio
- Flycutting




- Dyno Numbers of L92/L76 and LS3 Heads/Intake GTO's with stock displacement.

These cars are all 364 CID, and dyno numbers should be SAE to keep with the standard.

I have ordered them decending from the highest horsepower. If your information below needs updated, or you would like to be added to the list - please PM me or post up.

Thanks to PBANDPKGTO for gathering all the data.

Code:
[B]Screen Name	RWHP/RWTQ	Transmission	Camshaft		Portwork	ET @ MPH[/B]
				
PhillyGoat	486/435		M6		232/238 .595/.605 114	Heads|Intake
Johnehale2003	485/439		M6		231/234 .643/.598 111	Intake		11.88@116mph
SAjenkins24	479/430		M6		232/236 .600/.600 113	
kanibal		477/462		A4		224/230 .581/.581 114 	Heads
Tims05		476/416		A4		Cartek Custom		Heads|Intake	11.55@117mph
goatryder08	468/439		M6		216/229 .561/.562 113	Intake	
ArthurJGuy	461/421		M6		234/245 .64x/.60x 111	Heads|Intake	
DaGoat6Litre	459/436		M6		222/224 .566/.568 112	
skyfz_450	458/430		M6		228/240 .610/.612 115	
Badimpala	458/421		M6		227/239 .614/.624	Heads|Intake
KC2GIW		456/427		M6		228/240 .610/.612 115	Heads		12.90@117mph
Stevo		452/419		M6		224/240 .588/.591			12.40@110mph
TOCgoat		452/412		M6		228/244 .615/.615 115	Heads		
PBANDPKGTO	451/403		A4		232/236 .600/.600 113	Intake		11.22@120mph
CDRUM1		450/400		M6		228/230 .588/.591	
BeachGoat	449/409		M6		224/230 .581/.591 114	Intake		12.49@113mph
Badimpala	446/404		M6		228/240 .611/.610	Heads|Intake
Bambam		438/403		M6		232/236 .600/.600 113	
ShoddyHog	438/405		M6		228/232 .612/.600 111	Heads|Intake
TKO52		426/391		M6		242/242 .610/.610	
Scottward	415/407		M6		Stock LS2		Intake
gnfan		?		A4		227/235 .614/.620 114	Intake
very good info, thank you!
 
#8 ·
AJG how did you do that:confused:

I also have a break down of whose heads are ported and whose aren't if you could add that to it.

Great job.

Took me about 2 hours to gather the info-took you 2 minutes to fix everything LOL.
 
#9 · (Edited)
If you want to PM me the porting info, I'll add it to the list.

It was a mixture of Excel, and the CODE tag on the forum here.

Code respects tabs, this WYSIWYG editor does not.
 

Attachments

#10 ·
Looking at this list has just made me want to port a few things and get a little more agressive on the tune and make a run for the top of the list (dyno wise). haha.
 
#11 ·
Beach Goats time

12.49, 113mph

Also for those listed that have those "secret squirrel" cam specs I really wish you would "disclose" them. This thread is more of an informative thread for those thinking about doing the swap.

Along those lines, specs of a cam are one thing, but there is a lot more that just lift, duration, and lsa specs that make a cam work-so don't feel like you are divulging "priveledged" info.
 
#14 ·
Thanks-maybe a mod will step in and make it a sticky.
 
#17 ·
You need a couple more colums for Self Installed and Self Tuned so we know who the REAL studs are. :D

And I think my numbers should be 438/405.

Gerry
 
#18 ·
LMAO

Sorry-I am sure Arthur will edit it when he sees it.
 
#21 ·
Ttt
 
#22 ·
This should be stickied, along with all of the info on the L76/L92 and LS3 setups. Differences, whats needed to use them on an LS2, etc etc.
 
#23 ·
Just found your thread thank you for getting my info on there. As for post 17 I did all the install with the help of the other GTO's in Tulsa, we will get together to install anything. Had the intake ported and polished @ LS2 PortWorks. Guess I will take it back to the turner to try to squeez out another 2 rwhp to get to the top. Track time are in my sig.
 
#27 ·
Is it stock cubic inches or completely stock bottom end?
 
#28 ·
Well it is suppose to be stock bottom end.

We are giving Arthur a pass because he was nice enough to redo the list in an easy to read version LOL.
 
#29 ·
We should say stock cubes, I doubt I gained jack from the bottom end and my CR is lower then stock with the dish.

BTW, I'd still be stock bottom end if someone hadn't gotten to happy with the flycutting tool.
 
#33 ·
Whats up guys. Just wondering if most of you are running direct take-offs from the ls3 motors or if most guys are changing springs and whatnot. What is the stock LS3/LS6 springs lift?

Also, do you have to use the LS3 intake or will my LS2 ported one work?

Thanks.
 
#34 ·
I think all of us have different springs and you must use an LS3 intake. The LS2 will not work.
 
#35 ·
The heads are unported and i dont have any updated 1/4 miles times, as soon as i get back a new clutch, drag bags, gmm ripshifter, Mahan intake and a 150 shot are going on as well as some drag radials so ill let you know my times after that.
 
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