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Challenge Accepted, lol...

So I'm assuming you've verified that this Sienna has a 3.0L engine?

Based on the data you found, inline and V6 can both be non-interference. Looks to me like all 3.0L Toyotas are non-interference, except for the 1998 2JZ-GE. And you're not going to find that one in the Sienna.
http://en.wikipedia.org/wiki/Toyota_JZ_engine

Here's info on the engine in the Sienna
http://en.wikipedia.org/wiki/Toyota_MZ_engine

The 1MZ-FE covered Siennas through 2003. 2004 switched to the 3MZ-FE. Based on this forum post:
http://www.siennachat.com/forum/185-problems-maintenance-rep...
it sounds like the 2004 "2nd gen" definitely has an interference engine with the 3MZ-FE.

The 1MZ-FE seems interesting, lots of discussion and maybe even misinformation. Someone is quoted as saying that VVT-i versions of the 1MZ-FE are interference, and non VVT-i versions have valve depressions to reduce the chance of contact.
See http://wiki.answers.com/Q/Is_the_Toyota_1mz-fe_engine_a_inte...

Note that a 2002 Sienna could apparently have either type of engine, according to the list of models/engines given. So pop the hood and look for VVT-i logos.
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