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According to the number interchange manuals, only another 2004 engine is a direct swap.
 

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Welcome to Allpar. I believe that they were released in 2003 1/2 (January 2003) as a 2004 model. There is no 2003 Pacifica. If the 10th character in the VIN is a 4, then it is a 2004.
As Valiant says, the 2004 Pacifica takes the 2004 3.5L. The 3.5L in the LH is also different than in the CS.
What is wrong with your 3.5L.
 

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Welcome to Allpar. I believe that they were released in 2003 1/2 (January 2003) as a 2004 model. There is no 2003 Pacifica. If the 10th character in the VIN is a 4, then it is a 2004.
As Valiant says, the 2004 Pacifica takes the 2004 3.5L. The 3.5L in the LH is also different than in the CS.
What is wrong with your 3.5L.
cracked heads
 

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Did coolant leak down and damage the rings and bearings? If not, reman heads may offer more donor choices. The 2004-2007 3.5L CS (Pacifica) and LX (300, Magnum and Charger) used the same heads. Google: Mopar R5635446 for reman heads.
Google: Mopar R1635444 for the 2004 CS 3.5L long block.
Cracking aluminum heads are unusual. Even the head gaskets seem to hold up well on these.
This is an interference engine, so you should replace the timing belt, tensioner pulley and water pump while it's apart.
 
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