LS3 engine ID

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Feb 18, 2018 | 04:54 PM

tlyoung003

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8th Gear

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LS3 engine ID

I purchased an LS3 engine with a 6L80 transmission for a project I am working on. I was expecting to see the engine numbers 12584724 with 12600821 heads. What I have is 12621766 and 823 heads. Did GM make an LS3 motor using the LS9 block with the 823 heads? Just wanting to understand what I have. Thank you

Feb 18, 2018 | 06:22 PM

Vette_DD

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From: McKinney TX

St. Jude Donor '21-'22-'23-'24

The Corvette Black Book shows the same number you were expecting for the 2008 block, but the 2009 block has the number you got. The 823 head is designated as a pu (possible usage) head for 2009.

Feb 18, 2018 | 08:52 PM

tlyoung003

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Quote:

Originally Posted by Vette_DD

The Corvette Black Book shows the same number you were expecting for the 2008 block, but the 2009 block has the number you got. The 823 head is designated as a pu (possible usage) head for 2009.

Does this mean I have an L92 motor and not LS3?

Feb 18, 2018 | 09:46 PM

Vette_DD

Team Owner

Joined: May 2004

Posts: 82,175

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From: McKinney TX

St. Jude Donor '21-'22-'23-'24

Quote:

Originally Posted by tlyoung003

Does this mean I have an L92 motor and not LS3?

Only thing it says is that block & head are 376 ci and 430 HP. The LS9 is also 376 ci, but 638 HP. I'd say it's an LS3.

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