Generation III Internal Engine 1997-2006 LS1 | LS6
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what block is this?

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Old Jan 21, 2006 | 12:46 PM
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frisky2101's Avatar
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Default what block is this?

can someone ID this part number for me

12560676
or
12560626
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Old Jan 21, 2006 | 12:51 PM
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Originally Posted by frisky2101
can someone ID this part number for me

12560676
or
12560626
2000 LS1 block with a cored rear cover oil passage.
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Old Jan 21, 2006 | 12:56 PM
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thanks for in info. kinda makes me wonder would this be a "stock" block for a 99 TA?

I am kinda lost with the what you said about the cored rear cover oil passage?

What do this mean, anything special about it?

Last edited by frisky2101; Jan 21, 2006 at 11:56 PM.
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Old Jan 22, 2006 | 03:41 PM
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From: Beaumont, TX
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Originally Posted by frisky2101
thanks for in info. kinda makes me wonder would this be a "stock" block for a 99 TA?

I am kinda lost with the what you said about the cored rear cover oil passage?

What do this mean, anything special about it?
Yep, sounds like that would have been used in 1999 and 2000...

According to http://www.automotiverebuilder.com/ar/eb040538.htm

"The right front corner of the block was reinforced in '99 and there was a deep oil slot added to the back of the block to allow more oil to flow to the right hand lifter galley. Look for a 12559378 or a 12560626 casting."
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