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That is the Vortec 4.6L motor by GM. Good motor, built off of the 5.7L technology.

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Q: In trucks what is a LU3 engine?
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Is a1999 s-10 engine the same as a 2003 s-10 engine?

Not entirely. The LF6 was used in 1999, whereas the LU3 was used in 2003. The biggest difference is that the LU3 uses multi-port injection. Compatibility is possible, but I believe you'll need the corresponding ECM with each engine.


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