Calling all LS2 Experts
Instructor
Joined: Dec 2006
Posts: 179
Likes: 2
From: Bloomer WI
Gee, what does CNC ported Mean???
From http://www.gmperformanceparts.com/Pa...input=12564825
For those that have the 799 head and the rumor of GM dumping out these old Ls6 head, you may just be the lucky ones. The old ls6
Cylinder Head - Cnc Mach Showroom Stock Version Of 2002 LS6 Head
CNC-ported aluminum racing head
2.00" Hollow stem intake, and 1.55" sodium filled exhaust valves
.570" max valve lift
250 cc CNC'd "Cathedral port" intake ports
85 cc CNC'd D-shaped exhaust ports
61.9 cc CNC'd combustion chambers
Bare head p/n 12564825
The super good hollow valves.... small combustion chamber.
WOW
From http://www.gmperformanceparts.com/Pa...input=12564825
For those that have the 799 head and the rumor of GM dumping out these old Ls6 head, you may just be the lucky ones. The old ls6
Cylinder Head - Cnc Mach Showroom Stock Version Of 2002 LS6 Head
CNC-ported aluminum racing head
2.00" Hollow stem intake, and 1.55" sodium filled exhaust valves
.570" max valve lift
250 cc CNC'd "Cathedral port" intake ports
85 cc CNC'd D-shaped exhaust ports
61.9 cc CNC'd combustion chambers
Bare head p/n 12564825
The super good hollow valves.... small combustion chamber.
WOW
Drifting
Joined: Jul 2005
Posts: 1,533
Likes: 0
From: az
Gee, what does CNC ported Mean???
From http://www.gmperformanceparts.com/Pa...input=12564825
For those that have the 799 head and the rumor of GM dumping out these old Ls6 head, you may just be the lucky ones. The old ls6
Cylinder Head - Cnc Mach Showroom Stock Version Of 2002 LS6 Head
CNC-ported aluminum racing head
2.00" Hollow stem intake, and 1.55" sodium filled exhaust valves
.570" max valve lift
250 cc CNC'd "Cathedral port" intake ports
85 cc CNC'd D-shaped exhaust ports
61.9 cc CNC'd combustion chambers
Bare head p/n 12564825
The super good hollow valves.... small combustion chamber.
WOW
From http://www.gmperformanceparts.com/Pa...input=12564825
For those that have the 799 head and the rumor of GM dumping out these old Ls6 head, you may just be the lucky ones. The old ls6
Cylinder Head - Cnc Mach Showroom Stock Version Of 2002 LS6 Head
CNC-ported aluminum racing head
2.00" Hollow stem intake, and 1.55" sodium filled exhaust valves
.570" max valve lift
250 cc CNC'd "Cathedral port" intake ports
85 cc CNC'd D-shaped exhaust ports
61.9 cc CNC'd combustion chambers
Bare head p/n 12564825
The super good hollow valves.... small combustion chamber.
WOW
Team Owner
Joined: Feb 2000
Posts: 44,979
Likes: 892
From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
Here's an interesting case. I have a 10/30/2006 build date ...and one of each head. The passenger-side casting is a 243 and the driver's-side (viewable just underneath and behind the alternator) is a 799. Obviously, I'm hoping that the CNC-finished heads are determined to be the same part.
-Ernie
-Ernie
does your car pull to the right ?
Team Owner
Joined: Feb 2000
Posts: 44,979
Likes: 892
From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
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Melting Slicks
Joined: Mar 2006
Posts: 2,064
Likes: 4
I think that what needs to be confirmed is what is a 799 head? Flow, cc's, etc.
What engine was it designed for, why the change at GM, etc.
It was deliberate at GM for sure, there's a reason.
They are talkin about it here as well http://www.digitalcorvettes.com/foru...ad.php?t=73468
One thing is for sure, the 2007 C6 will go down in history with this quirk.
What engine was it designed for, why the change at GM, etc.
It was deliberate at GM for sure, there's a reason.
They are talkin about it here as well http://www.digitalcorvettes.com/foru...ad.php?t=73468
One thing is for sure, the 2007 C6 will go down in history with this quirk.
Le Mans Master
Joined: Oct 2005
Posts: 5,038
Likes: 878
From: Tampa Florida
And I believe the 05 Tahoe 5.3 has more hp than the 02 Tahoe, 25 more hp.
My casting number is 862. So maybe the 799 are refined heads for 07. Let keep an eye on the stock dyno number.
Team Owner
Joined: Feb 2001
Posts: 27,227
Likes: 113
From: Short Hills, NJ
Yeah that's yet another 5.3L, they have a bunch of versions of that motor, iron truck block, all aluminum truck block, first year SSR all aluminum, the new all aluminum 303hp Impala/Monte/GP motor....
Drifting
Joined: May 2006
Posts: 1,335
Likes: 7
From: Winfield IL
243's here. car was built on 10/23/2006
2007 Z51 M6 2,600 miles
Mods:
Vararam Cold Air Induction w/ Throttle Body Spacer
Corsa Sport Catback Exhaust (Quad Tips)
LG Motorsport Pro Long Tube Headers w/LG X-pipe (highflow cats)
LS2 Port Works Ported Intake Manifold
LS2 Port Works Ported Throttle Body
Speed Inc. Dyno Tune
Car made 390.75 RWHP 392.44 RWTQ (DynoJet)
2007 Z51 M6 2,600 miles
Mods:
Vararam Cold Air Induction w/ Throttle Body Spacer
Corsa Sport Catback Exhaust (Quad Tips)
LG Motorsport Pro Long Tube Headers w/LG X-pipe (highflow cats)
LS2 Port Works Ported Intake Manifold
LS2 Port Works Ported Throttle Body
Speed Inc. Dyno Tune
Car made 390.75 RWHP 392.44 RWTQ (DynoJet)
