Don't know for sure myself, but have you done a search on 1.5JZ?
I'm pretty sure I've heard of those changing the 1J block to the 2J version using the 1J head (hence the 1.5J) because apparently it flows better, but keeping the 1J wiring by removing the 2J sensors from the block & installing the 1J versions there instead.
I'm curious to know why it'd be easier to use the 1J wiring?
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