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Just putting feelers out here, since a fairly through look around didn't yield any results.
I recently acquired a 06 GS430, and I was curious if the 2uz and 3uz heads were interchangeable, and here's why:
I have a set of 2uz VVTI heads and cams, built, ported, o.s. valves and stronger springs for a build I was going to SC. but that fell to the wayside and I would love to put the 10k I have in these heads to use. Will they play nice with the 3uz?