If you have a 1989 Nissan Pathfinder 4x4 3.0 V6 and would like to put in a 3.3 V6 is this possible?

Agree - lots of work for only 0.3L of displacement. Try these: iridium plgs from ngk (both help my mpg), get a better air intake, check and post to the npora boards for performance mods. What is your goal??

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I disagree, unless you have no previous engine experience. The 3.3 is near the exact same block and you can swap everything from the 3.0 onto the 3.3 with minimal problems or modifications. It's been done by more than a few people. Search NPORA for more info. http://npora.ipbhost.com