Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > Generation III Internal Engine
Sign in using an external account
Register Forgot Password?
Search

Generation III Internal Engine
1997-2006 LS1 | LS6
Sponsored by
Texas Speed & Performance

Reply
 
Thread Tools Search this Thread
Old 05-03-2009, 03:27 PM   #1
TECH Apprentice
Garage is empty, add now
 
wht97ws6ta's Avatar
 
Trader Rating: 0
Join Date: Dec 2008
Location: Kinston North Carolina
Posts: 358
Default 799 casting 4.8/5.3 truck heads.

Has anyone messed with any of these yet. I just recently got my hands on a 5.3 aluminum motor out of a 05 Z71. It was supposed to have had a rodbearing knock, but the bearings were fine. For some reason the pistons had a ton of carbon on them and a bunch of loose chunks in the cyls. Which im sure was the knock that was heard. But anyhow to cut to the chase. This thing come with 799 heads which looks just like an LS6 head as far as the chamber shape. It has 2.00/1.55 valves. I tooked one off and got it on the flowbench at work. As cast they went 275 @ .600 int and 198 on the exh. I did some port work and a 5 angle valve job and got it up to 313 on the intake with alot of airspeed on the shortside. The exhaust went 243, both at .600 lift. I still got some work to do on the intake. Im pretty sure i can get 325ish outta it. Soon as i get them done ima write the CNC program on them. I just thought that was pretty impressive numbers for a production head. Im planning to put a victor junior and a 750 holley on it with a cam to drop it in my 87 El Camino. Just wondering if anyone knew much about these heads and thought i would share what i have learned from them.
wht97ws6ta is offline   Reply With Quote
Old 05-03-2009, 05:06 PM   #2
TECH Fanatic
Garage is empty, add now
 
Ryan02SS's Avatar
 
Trader Rating: 3
Join Date: May 2003
Location: Lake Anna, VA/ Fairmont, WV
Posts: 1,795
Default

The #799's are the same as the #243 LS6/2 heads. Standard 24N Stainless valves, 2.00I, 1.55E, 210cc intake runner. The come standard on the L33HO 5.3L and 07+ 5.3L's.
My 08 Sierra has the #799's.
__________________
2008 GMC Sierra 1500 4X4, Z71, Fire Red EC/RB "LY5" Gen IV 5.3L, 4L60E, AutoTrac, G80 locker, HD Trailering Package

Sadly Sold!!! 02 Silver SS #8774 H/C
420rwhp @ 396rwtq thru QTEC
12.4 @ 117 2.0 60 275 555R 3.42s 1300DA
Ryan02SS is offline   Reply With Quote
Old 05-03-2009, 05:29 PM   #3
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 3
Join Date: Nov 2008
Posts: 725
Default

So these bolt up to an ls1 with no mods? and they = to an 243 casting?
w3s1c0a5t is offline   Reply With Quote
Old 05-03-2009, 07:06 PM   #4
Moderator
Garage is empty, add now
 
SweetS10V8's Avatar
 
Trader Rating: 4
Join Date: Jun 2004
Location: Michigan
Posts: 2,584
Default

Yes..
__________________
Quote:
Originally Posted by John Lingenfelter
The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power.
SweetS10V8 is offline   Reply With Quote
Old 05-04-2009, 06:37 PM   #5
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 3
Join Date: Nov 2008
Posts: 725
Default

What all does the l33ho come in? i havent heard of it.
w3s1c0a5t is offline   Reply With Quote
Old 05-04-2009, 07:45 PM   #6
On The Tree
Garage is empty, add now
 
BORN2FLY's Avatar
 
Trader Rating: 76
Join Date: Jan 2007
Location: Hattiesburg (Camp Shelby), MS
Posts: 140
Default

5.3L, VIN B (8th digit, opt L33) comes in some 05+ Trucks

2004 (only) Chevy SSR, 2004+ Isuzu Ascender, 2004+ Buick Rainier, 2004+ GMC Truck Envoy XUV, 2004+ Chevy TrailBlazer EXT: 5.3L (VIN P, 8TH DIGIT)
BORN2FLY is offline   Reply With Quote
Old 05-05-2009, 04:18 AM   #7
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 3
Join Date: Nov 2008
Posts: 725
Default

Quote:
Originally Posted by BORN2FLY View Post
5.3L, VIN B (8th digit, opt L33) comes in some 05+ Trucks

2004 (only) Chevy SSR, 2004+ Isuzu Ascender, 2004+ Buick Rainier, 2004+ GMC Truck Envoy XUV, 2004+ Chevy TrailBlazer EXT: 5.3L (VIN P, 8TH DIGIT)
You are the man sir.
w3s1c0a5t is offline   Reply With Quote
Old 05-05-2009, 09:07 AM   #8
9 Second Club
Garage is empty, add now
 
CodeRed2000SS's Avatar
 
Trader Rating: 0
Join Date: Jan 2006
Location: Kinston, NC
Posts: 457
Send a message via AIM to CodeRed2000SS
Default

well dang, i learn something everyday.
__________________
1968 RS/SS camaro
2000 Camaro SS M6
1981 Malibu LSX project (coming soon...)
CodeRed2000SS is offline   Reply With Quote
Old 05-05-2009, 09:54 AM   #9
TECH Apprentice
Garage is empty, add now
 
Trader Rating: 4
Join Date: Dec 2008
Location: Broken Arrow, OK
Posts: 317
Default

I just picked up a L33 also. This was pulled from another thread.

Quote:
Originally Posted by cabech984 View Post
Here ya go, I found this on GM powertrain.com.

RPO L33 FOR CHEVROLET SILVERADO AND GMC SIERRA
The Gen III Vortec 5300 is available in a new lighter, higher output variant optional on some 2005 Silverados and Sierras. RPO L33 will be introduced in short bed, extended cab versions of these pickups. The L33 features an aluminum engine block, new cylinder heads and a high-lift cam. Torque will increase, and horsepower is expected to exceed 300 in final production trim.

One of the L33’s distinguishing features is its engine block. As with the 2004 LM4 Vortec 5300, the L33’s foundation is a cast-aluminum block with pressed-in iron cylinder liners, similar to the block used for GM Powertrain’s LS1 and LS6 car V-8s. The L33 block is exceptionally light; as a result, a fully dressed L33 is 100 pounds lighter than cast iron-block Vortec 5300s (RPOs LM7 and L59).

The L33 takes its cylinder heads from the LS6. Originally developed for the Z06 Corvette, these heads improve airflow in and out of the engine. With their pent-roof combustions chambers and new flat top pistons (the pistons in other Gen III Vortec 5300s have a slight sump in the piston deck), the L33’s compression ratio increases from 9.5:1 to 9.9:1. This increase improves the engine’s volumetric efficiency yet still allows it to achieve full power with regular grade gasoline.

Finally, the L33 is equipped with a higher-lift camshaft. Maximum valve lift increases from 11.6 mm on the LM7 and L59 to 12.5 mm. The new cam and compression ratio are the primary sources of the L33’s increased horsepower.

The L33 camshaft and cylinder heads were developed in conjunction with the new Gen IV Vortec 5300 (RPO LH6). The design objective was more horsepower for customers who need it, without requiring a step up to the Vortec 6000 (and an increase in operational costs). RPO L33 expands GM Powertrain’s lineup of Vortec V8s and gives GM’s truck customers even more flexibility and choice.

The L33 Vortec 5300 will be built at Powertrain’s Romulus, Mich., engine plant. With its introduction, Powertrain will cease production of Vortec 5300 RPO LM4. The Buick Rainier, Chevrolet Trailblazer EXT and GMC Envoy XL, previously equipped with the LM4, will now be powered by the Gen IV Vortec 5300 with Displacement on Demand. The 2005 Chevrolet SSR will be powered by the new LS2 truck V-8.



They had the LM4.

Quote:
Originally Posted by BORN2FLY View Post
2004 (only) Chevy SSR, 2004+ Isuzu Ascender, 2004+ Buick Rainier, 2004+ GMC Truck Envoy XUV, 2004+ Chevy TrailBlazer EXT: 5.3L (VIN P, 8TH DIGIT)
gjohnson is offline   Reply With Quote
Old 01-18-2012, 01:31 PM   #10
Teching In
Garage is empty, add now
 
07silveradoZ71's Avatar
 
Trader Rating: 0
Join Date: Jan 2012
Location: Sarepta, Louisiana
Posts: 12
Default

Ok so i'm bummed out that my truck didn't come with L33, but I have found a 07' (new body style) with 799 heads, but an iron block, dose this motor share the same pistons and camshaft as the L33? Also, the motor has a different throttle body and intake than mine ( looks like a better pice )
07silveradoZ71 is offline   Reply With Quote
Old 01-18-2012, 02:01 PM   #11
TECH Fanatic
2002 Pontiac Formula Firehawk
My Garage
 
'02 WS6's Avatar
 
Trader Rating: 71
Join Date: Aug 2006
Location: Texas
Posts: 1,539
Default

I ran 799s worked on by PRC/TSP, milled .030, 2.02/1.60 Ferrea valves, on my LS6 in my TA. They're currently on a 376ci making 500+ rwhp so the heads do have potential if in the right hands.
'02 WS6 is offline   Reply With Quote
Old 01-18-2012, 03:28 PM   #12
TECH Addict
Garage is empty, add now
 
Trader Rating: 11
Join Date: Nov 2009
Location: Western PA
Posts: 2,353
Default

L33 engines come with flat top pistons and coated piston skirts and, floating pins...regular 5.3 have dishes...the l33 also has the newer style rods too. I just got an L33 for -$100 lol, but anyway when I pulled oil pan I was suprised to see that the stock rods look much nicer than my buddies eagle rods he bought for his stang...L33 is a great engine because you get just bout 10 to 1 comp, as well as the good ls6 heads, and you get the 80 pounds of weight savings over an iron block
wildcamaro is offline   Reply With Quote
Old 01-18-2012, 11:44 PM   #13
TECH Senior Member
1998 Pontiac Trans Am
 
SOMbitch's Avatar
 
Trader Rating: 8
Join Date: Sep 2007
Posts: 6,894
Default

LOL back from the dead...

I just happened by the OP's (Drew) work when he had done the first ports. I need to ask him if that motor made it into the El Camino......
__________________
HKE 403
A4/SS3600 23x/24x 487rwhp/456rwt thru cats
SOMbitch is offline   Reply With Quote
Old 01-29-2012, 06:01 PM   #14
Teching In
Garage is empty, add now
 
Trader Rating: 0
Join Date: Jan 2012
Location: Any where I am stationed
Posts: 11
Default

I am planning to get a hand on a set of 799 castings. Does AI have the power to CNC'D these things to potentially lay down 500RWHP?(with other mods of course)
6SPDN is offline   Reply With Quote
Old 01-29-2012, 06:08 PM   #15
TECH Resident
Garage is empty, add now
 
99 Blue Bird's Avatar
 
Trader Rating: 3
Join Date: May 2008
Location: CALI 707
Posts: 815
Default

Quote:
Originally Posted by 6SPDN View Post
I am planning to get a hand on a set of 799 castings. Does AI have the power to CNC'D these things to potentially lay down 500RWHP?(with other mods of course)
Do a search
__________________
99 Trans Am- LS1 Motorsports Lid, SLP Mass Air, Textrallia OZ700, Synergy Motorsports Built T-56, Rebuilt shortblock with ARP 2000 rod bolts, ARP head bolts, Pat G spec EPS cut cam 218/230 .595/.600 lift 115+4, Advanced Induction 226cc CNC 799 heads with PAC 1218 springs , UMI K Member, UMI Torque Arm Relocation (SOLD)

1969 Pontiac Firebird- A Project And A Half
99 Blue Bird is offline   Reply With Quote
Old 01-29-2012, 07:22 PM   #16
Launching!
Garage is empty, add now
 
Trader Rating: 1
Join Date: Jul 2009
Location: Rosedale, Indiana
Posts: 294
Send a message via Yahoo to remauto1187
Default

Quote:
Originally Posted by 99 Blue Bird View Post
Do a search
This clown has way too much time on his hands....to make the effort to put down "do a search".... Probably as useless as **** on a boar!
remauto1187 is offline   Reply With Quote
Old 01-29-2012, 07:40 PM   #17
Vortec Scout II
Garage is empty, add now
 
Bo185's Avatar
 
Trader Rating: 0
Join Date: Jul 2005
Location: Beebe, Arkansas
Posts: 1,676
Default

The Gen IV 4.8l/5.3l 2007 up motors have the 799/243 heads. All 4.8's are iron blocks. 5.3L are a mix of iron and AL block. And all the 5.3L are flat tops now. Also both have a 87mm intakes and TB's.

I have even seen a GMT900 truck (2007-up) with one 799 on one side and a 243 on the other. On the same motor from GM.

Also the 2010 plus truck motors ALL have VVT save for the old 4.3L!
__________________
'73 Scout II 4x4 Vortec 5.3 4L65E np241

'01 VW Beetle TDI-50mpg or better!

'56 Belair 4 door hardtop*next LSx project* 5.3/4l60/3.08's (looking for 25+mpg!)

TECH: Gen III/IV "LS motor" to Non Gen III/IV Auto Trans
Bo185 is offline   Reply With Quote
Old 01-29-2012, 09:01 PM   #18
TECH Senior Member
2000 Chevrolet Camaro
My Garage
 
NemeSS's Avatar
 
Trader Rating: 123
Join Date: Sep 2005
Location: Houston,TX
Posts: 6,646
Default

I have an iron block 4.8 with flat top pistons, came equipped with 243 heads. But the truck/suv engines with 243/799 heads did not come equipped with hollow stem valves.
So they are not ls6 heads. Ls6 heads only came on ls6 5.7 engines and nothing else
NemeSS is offline   Reply With Quote
Old 01-29-2012, 09:51 PM   #19
Vortec Scout II
Garage is empty, add now
 
Bo185's Avatar
 
Trader Rating: 0
Join Date: Jul 2005
Location: Beebe, Arkansas
Posts: 1,676
Default

Quote:
Originally Posted by NemeSS View Post
I have an iron block 4.8 with flat top pistons, came equipped with 243 heads. But the truck/suv engines with 243/799 heads did not come equipped with hollow stem valves.
So they are not ls6 heads. Ls6 heads only came on ls6 5.7 engines and nothing else
All 4.8L are flat tops. The L33 and later Gen IV 5.3L uses the 4.8L pistons were the same part number at one time.

But correct on the heads, the truck 243's are not the LS6 heads exactly, just the same castings.
__________________
'73 Scout II 4x4 Vortec 5.3 4L65E np241

'01 VW Beetle TDI-50mpg or better!

'56 Belair 4 door hardtop*next LSx project* 5.3/4l60/3.08's (looking for 25+mpg!)

TECH: Gen III/IV "LS motor" to Non Gen III/IV Auto Trans
Bo185 is offline   Reply With Quote
Old 02-11-2012, 10:51 PM   #20
Launching!
2003 Chevrolet S-10
 
ZQ8LS1's Avatar
 
Trader Rating: 3
Join Date: Sep 2011
Posts: 256
Default

Good info !!

Thanx
ZQ8LS1 is offline   Reply With Quote
Old 02-11-2012, 10:51 PM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ebay Motor City 243/799 heads 2000NemeSS Generation III Internal Engine 7 03-16-2013 06:49 PM
Cartek Stage 2 heads MattysTA Parts Classifieds 17 09-02-2012 10:05 AM
Stage 3 CNC Ported 853 LS1/LS6 Heads w/PRC Extreme Valve Springs ($700 Shipped) edwardzracing Parts Classifieds 4 10-30-2011 02:05 PM
R 799 heads any good how bout the 4.8's? 1sicss Generation III Internal Engine 9 07-07-2011 08:29 AM
Anyone ever repaired IAC Valve? 1SLwLS1 General Maintenance & Repairs 7 08-11-2010 10:57 AM


Tags
12, 48, 53, 799, cam, casting, chevy, compression, heads, knocking, l33, ly5, numbers, sec, truck


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



Join Ls1Tech

All times are GMT -5. The time now is 09:37 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details