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Unread 09-13-2013, 01:49 AM   #1
rockatansky666
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Engine year manufacture

Is there any casting / block numbers anywhere to determine when are roughly when the engine was made. I have 2001 WJ and had to buy a low mileage used engine due to position skirt issue.
Post 2000 motors are slightly different, or so I've read so I want to be sure I have the correct one. Thanks

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Unread 09-13-2013, 01:35 PM   #2
rockatansky666
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Anyone? Please?
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Unread 09-13-2013, 01:39 PM   #3
ChrisHager
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http://jeep4.0performance.4mg.com/tech_specs.html

Keep in mind, the 0331 head has the potential of cracking as well.
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