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