Generation III Internal Engine 1997-2006 LS1 | LS6
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Old Sep 15, 2007 | 03:55 PM
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Default LS block ?

I know this question has been asked before. I would like to know how to tell if my car has the LS6 or LS1 block. I know I have the 241 casting heads on the car but I know know how to tell which block it has. Can anyone help me out on this one??
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Old Sep 15, 2007 | 04:05 PM
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On the back of the motor, below where the head bolts to the block is the casting #. If the motor is still in the car you are going to need a mirror and a flash light. LS6 is 12561168. I just got an 02 motor and it's the ls6 block.
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Old Sep 15, 2007 | 08:20 PM
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Is there any other place on the block and would be eaiser to read??
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Old Sep 16, 2007 | 05:04 AM
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Nope that's the only spot. Use a small mirror that extends. Also ls1 blocks can have a dull or bright appearance to the aluminum, but all the ls6 blocks are of the dull grey like appearance. 10-15% of all 01s and 25% of all 02s have the ls6 block.
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Old Sep 16, 2007 | 03:36 PM
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thanks for the info!!
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