LS1 versus LS6 Block
Thread Starter
Heel & Toe
Joined: Jul 2004
Posts: 15
Likes: 0
Yes, I know that, but it's my understanding they started using the new LS6 block in 2001. However, there was a change-over date so I don't believe all 2001 non-Z06's had the LS6 block (not the LS6 cam, heads, etc.).
Team Owner
Joined: Jul 2001
Posts: 21,391
Likes: 1,011
From: Various places in Southern California.
There's a machined area on the block deck just in front of the passenger side head. On an LS6 block the machined out portion is larger than on an LS1. Sorry, I don't have any pictures, but if you look at a 2002 and later car, and compare it to a 2000 and earlier car, you'll see the difference.
Pro
Joined: May 2004
Posts: 673
Likes: 1
From: Pembroke Pines Florida
Originally Posted by ragtopws6
Casting # 12561168 is located behind and below driver's side cylinder head. Use a small mirror to see it.
Sooooo does that number mean it is a LS1 or LS6. Sorry if I am missing something here.
Scott
Melting Slicks
Joined: Feb 2003
Posts: 2,966
Likes: 22
From: Frederick Maryland
St. Jude Donor '08-'09-'10-'11
Originally Posted by pmcw
In a 2001, how can I tell is my coupe has an LS6 block?
Last edited by ragtopws6; Jul 27, 2004 at 05:24 PM.
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Instructor
Joined: Oct 2001
Posts: 249
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From: Mesa AZ
As stated, if it is a 2001, it should have a new (LS6) block. My 2001 TransAm built in the first week of October had a new block. I imagine that the Corvettes were switched over by then as well. I personally haven't seen a 2001 yet with an old block and I've seen quite a few!
Mike
Mike
Melting Slicks
Joined: Feb 2003
Posts: 2,966
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From: Frederick Maryland
St. Jude Donor '08-'09-'10-'11
Originally Posted by Mike Mercury
THANK YOU !!! 
will be checking my July 2001 built '02.
will be checking my July 2001 built '02.
-Rick
Team Owner
Joined: Jul 2001
Posts: 21,391
Likes: 1,011
From: Various places in Southern California.
Originally Posted by Mike Mercury
THANK YOU !!!
will be checking my July 2001 built '02.
will be checking my July 2001 built '02.