Which Cylinder Heads Came On Your TBSS - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-09 SS Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Engine tuning and/or modifications

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  #1  
Old 03-22-2007, 10:34 PM
CodyC6 CodyC6 is offline
 
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Which Cylinder Heads Came On Your TBSS

The Corvette forum was jumping today because one of us discovered that their LS2 with a build date of 10/2006 actually came with the Cylinder Heads coded #799, and not the standard #243 (casting number). This caused a big issue today because nobody can figure out why GM put different heads on a small batch of LS2's and then went back to the #243, and we don't know if there is any difference.

So, I checked my TBSS today, and really oddly, my TBSS has a #799 cylinder head on the passenger side, and a #243 cylinder head on the drivers side. The coding or Casting number is near the backside of the head on the passenger side if it's a 799, it would be near the front of the head on the passenger side if it's a 243. The reverse order for the drivers side. With a flashlight you can see both on our TBSS's pretty easily. Of all the confusion, I was the only LS2 that had one of each. I'm wondering if you all could take a look at yours and see which heads you have. The only 799's we have seen on the Corvette forum had build dates of 9/2006 and 10/2006. I'll try to get a link to what the discussion is. Of all the research they have done so far, the 799's were not meant for the LS2, but we haven't heard the results yet.
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  #2  
Old 03-23-2007, 01:39 AM
Chi-TownSS Chi-TownSS is offline
 
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I have a 07 TBSS with a 08/06 build date with #243's. Not sure why they would use 2 different #'s on yours.
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Old 03-23-2007, 01:55 AM
PEDRO PEDRO is offline
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WE noticed that aswell when i change my heads.
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Old 03-23-2007, 08:59 AM
CodyC6 CodyC6 is offline
 
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Quote:
Originally Posted by PEDRO View Post
WE noticed that aswell when i change my heads.
Do you remember which ones came on your truck?
Was it a combo too? Thanks.
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  #5  
Old 03-23-2007, 12:04 PM
BlazerVette BlazerVette is offline
 
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2007 SS owners check your heads!!!

Just wanted to let you guys know about a interesting topic going on over at the Corvette Forum about the wrong heads being put on some of the later 2007 vettes. The LS2 heads wich is the same as the LS6 head has a casting number of 243. Problem is that some of the LS2 have heads with a casting number "799" truck heads, wrong head!!!
I have checked mine and it has the 243 castings.
A vette owner dynoed his vette with some mods and only pulled 345!!!
So far 5 07 vettes have this head
If you have this issue chime in.
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Old 03-23-2007, 12:09 PM
arn710 arn710 is offline
 
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I'm heading out to the parking lot right now to check it out. Stay tuned to for updates

EDIT: 243s on both sides

Check the on the top, front corner on the passenger side, and the top, rear corner on the drivers side
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Old 03-23-2007, 01:00 PM
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Old 03-23-2007, 01:25 PM
SuperSS27 SuperSS27 is offline
 
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Im gonna have to double check mine. I don't want 799's....:-(
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Old 03-23-2007, 02:11 PM
dv_tbss06 dv_tbss06 is offline
 
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and where exactly is this # ???? so i can check mine out !
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Old 03-23-2007, 02:22 PM
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and where exactly is this # ???? so i can check mine out !
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Originally Posted by arn710 View Post
Check the on the top, front corner on the passenger side, and the top, rear corner on the drivers side
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