LS3 or L92....how do I tell?
Teching In
Joined: Sep 2006
Posts: 18
Likes: 0
They are cast at different locations, the truck heads are cast in Mexico and use a different process and the vette heads are cast here in Michigan. GM uses the same casting design on both (port shape and configuration and flow) but the numbers are different for tracking purposes since there are 2 locations.
So casting 821 and 823 are identical? Is there any difference like combustion chamber size or intake runner design. I was thinking the 821 would flow a bit better since they're on the vettes. I may be wrong. Maybe the cc size is smaller therefor upping the static compression and yielding more power or maybe its just the hollow stem config. Someone shed some light on this.
Teching In
Joined: Aug 2008
Posts: 44
Likes: 0
The early l92 heads are gonna be a diff #, they had trouble with valves and retainers breaking, valve falling into the cylinder, then bang right back through the head, just not back through the valve guide, came out pretty much where ever the F it wanted to. Im a tech at Cadi and saw a bunch of those, so im pretty familiar with swapping a 6.2 into those things. But anyways they were replaceing the old engines with new ones with new or diff # heads on them.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
I found a set of 823 heads for 350 for the pair but I was gonna buy 12582714
from gm for 380 for the pair. It really boils down to shipping but are the 12582714 (out of 07 escalade) same as the 823 castings?
from gm for 380 for the pair. It really boils down to shipping but are the 12582714 (out of 07 escalade) same as the 823 castings?
Teching In
Joined: Mar 2010
Posts: 16
Likes: 0
From: warren Mi
They are cast at different locations, the truck heads are cast in Mexico and use a different process and the vette heads are cast here in Michigan. GM uses the same casting design on both (port shape and configuration and flow) but the numbers are different for tracking purposes since there are 2 locations.
Teching In
Joined: Mar 2010
Posts: 16
Likes: 0
From: warren Mi
The motor is a flex fuel motor.I haven't seen or read anywhere in my paperwork to sugest that this is a varible valve timing motor.Can't find any info on this motor just looking to get educated more
Last edited by rb6.2; Mar 9, 2010 at 06:59 PM.
Do you have the window sticker? The easiest way is to look at the front cover near the top, whether it is flat or not. They might make them but I have never seen a 6.2 that wasn't a VVT engine from the factory. Either way it is not just an LS3 with a different cam in it.
Teching In
Joined: Mar 2010
Posts: 16
Likes: 0
From: warren Mi
I looked today, at my window sticker and the stickers under the hood and the both say 6.2 ffv or flex fuel vehical. I pretty sure this isnt a vvt motor unless u prove me wrong.and what i read about the heads differ from the ls3 by a lighter spring and a cam for the truck pulling tq courve..?
Teching In
Joined: Mar 2010
Posts: 16
Likes: 0
From: warren Mi
I looked today, at my window sticker and the stickers under the hood and the both say 6.2 ffv or flex fuel vehical. I pretty sure this isnt a vvt motor unless u prove me wrong.and what i read about the heads differ from the ls3 by a lighter spring and a cam for the truck pulling tq courve..?
Heads don't make it an LS3, sorry.
Look in your glove box or console and look for a label (called a SPID label, service parts identification label) that has a lot of 3 digit alphanumeric groups. You will see all of the option codes for the truck. You will see the L9H if its a 2010 truck. Not sure what else to tell you. The heads use the same casting, they have for years, other than that the similarities end. What is the big deal anyways?
Look in your glove box or console and look for a label (called a SPID label, service parts identification label) that has a lot of 3 digit alphanumeric groups. You will see all of the option codes for the truck. You will see the L9H if its a 2010 truck. Not sure what else to tell you. The heads use the same casting, they have for years, other than that the similarities end. What is the big deal anyways?
Teching In
Joined: Mar 2010
Posts: 16
Likes: 0
From: warren Mi
Heads don't make it an LS3, sorry.
Look in your glove box or console and look for a label (called a SPID label, service parts identification label) that has a lot of 3 digit alphanumeric groups. You will see all of the option codes for the truck. You will see the L9H if its a 2010 truck. Not sure what else to tell you. The heads use the same casting, they have for years, other than that the similarities end. What is the big deal anyways?
Look in your glove box or console and look for a label (called a SPID label, service parts identification label) that has a lot of 3 digit alphanumeric groups. You will see all of the option codes for the truck. You will see the L9H if its a 2010 truck. Not sure what else to tell you. The heads use the same casting, they have for years, other than that the similarities end. What is the big deal anyways?