A70TTR
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it's incorrect information.
Joel Luz of TRD USA and ToySport fame confirmed the 2JZ was entirely modified and refined by Toyota in house.
All they did is bump the blocks deck height for the longer rods and they took the Yamaha head design from the 1J and opened it up to flow more for the larger displacement. Despite that, Yamaha did not do any development on the 2J.
Joel Luz of TRD USA and ToySport fame confirmed the 2JZ was entirely modified and refined by Toyota in house.
All they did is bump the blocks deck height for the longer rods and they took the Yamaha head design from the 1J and opened it up to flow more for the larger displacement. Despite that, Yamaha did not do any development on the 2J.
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