[Z06] LS6 vs LS1 blocks
Thread Starter
Heel & Toe
Joined: Aug 2005
Posts: 23
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From: LeClaire Iowa
LS6 vs LS1 blocks
Is there any quick and easy external ways to tell the LS6 block from the LS1 block?
Any I.D. markings or numbers?
Any I.D. markings or numbers?
Last edited by yldride; Mar 4, 2007 at 03:41 PM.
Burning Brakes
Joined: Sep 2006
Posts: 1,102
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There's an identification barcode sticker on the left hand side of the block near the engine mounts. It gives you a code number that will tell you what engine is in your Z06. Your GM dealer parts dept. can tell you the codes for the C5 and LS6. I also think the C5 Registry offers the codes. I believe I saw them there.
Thread Starter
Heel & Toe
Joined: Aug 2005
Posts: 23
Likes: 0
From: LeClaire Iowa
There's an identification barcode sticker on the left hand side of the block near the engine mounts. It gives you a code number that will tell you what engine is in your Z06. Your GM dealer parts dept. can tell you the codes for the C5 and LS6. I also think the C5 Registry offers the codes. I believe I saw them there.
Did I mention quick and easy. Thanks anyway. I'm begining to think that there is no way to tell the difference.
Last edited by yldride; Mar 7, 2007 at 02:56 PM.
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
For the 2001 Model Year (MY) there were two different blocks for the LS1 and LS6, I believe starting with the 2002 MY the same block (Z06 cast windows) was used for both engines. The earlier LS1 block had drilled ports, the Z06 block had cast windows in the bulkheads for better bay-to-bay breathing.
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
I posted this on another forum to your question.
Externally, there is a difference between the color of the LS1 versus the LS6 blocks. The LS6 block has a darker grey appearance and looks less finished than the LS1 block. Other than that you will need to look internally to find the differences. Internally the LS6 has ports down by the mains that allow pressure to distribute equally between the bottom of the block. The LS1 block does not have these ports.
Externally, there is a difference between the color of the LS1 versus the LS6 blocks. The LS6 block has a darker grey appearance and looks less finished than the LS1 block. Other than that you will need to look internally to find the differences. Internally the LS6 has ports down by the mains that allow pressure to distribute equally between the bottom of the block. The LS1 block does not have these ports.
Last edited by Sigforty; Mar 7, 2007 at 04:52 PM.
Pro
Joined: Jul 2003
Posts: 718
Likes: 0
From: Winnebago IL
they windowed the block a bit I think to allow for higher revs w/out built up pressures. I seem to recall this in the vhs video that came with my C5 z06. I might be using the wrong terms, but the block is different from what I can remember unless they made it a running change into all LS type blocks after 01
EDIT***
found this
http://216.25.99.66/LS1LS6/lscastingnumbers.html
seems as if it was a running change in the LS1 block for the LS6 version. So the casting seems to be the same ie same block but not sure if there are internal differences. Would suspect no, but I don't know enough to keep myself out of trouble with the wife, so I won't go on record here saying either way. :O
EDIT***
found this
http://216.25.99.66/LS1LS6/lscastingnumbers.html
seems as if it was a running change in the LS1 block for the LS6 version. So the casting seems to be the same ie same block but not sure if there are internal differences. Would suspect no, but I don't know enough to keep myself out of trouble with the wife, so I won't go on record here saying either way. :O
Last edited by CoronaL; Mar 7, 2007 at 05:44 PM.
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Pro
Joined: Jul 2003
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From: Winnebago IL
Thread Starter
Heel & Toe
Joined: Aug 2005
Posts: 23
Likes: 0
From: LeClaire Iowa
(external proof) Thanks everyone.
