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Generation III Internal Engine 1997-2006 LS1 | LS6
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Which engine I have?

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Old 12-15-2018 | 01:28 PM
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Default Which engine I have?
Hi
I have a new chevy engine for my truck.
c71164469 laser printed at the left handside at the back of the block. And also 12567392 when you look from behind.
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Old 12-15-2018 | 08:57 PM
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The 12567392 GM part number is for a 5.3 block, specifically a LM7.
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Old 12-16-2018 | 08:40 AM
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Yes, but that block also supports the smaller 4.8 liter engine. If it has pistons with dished tops, its a 5.3.

Rick
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Old 12-16-2018 | 08:58 AM
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Pistons are dished
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Old 12-18-2018 | 09:31 PM
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Well then you have the 5.3.
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