A major unsolved problem for the Toyota 1JZ-GTE | 2JZ-GTE engines is the upper water neck. Especially in swaps. It's bulky, it's difficult to fabricate on, and it just doesn't make sense for most setups. Even in factory JZ chassis...the hose routes up and over to the opposite side it starts. This problem continued when we started developing this solution. The outlet on the engine, the amount of things needing to attach to it, and the internal size we needed to keep made designing a compact solution extremely challenging.
The lower bolt for the water neck goes right through the path we wanted the outlet to face. If you run a long bolt all the way through that portion you'd have to raise the neck another 1.5" which is not what we set out to do. After many designs we found a great solution. Make the lower port a small spade so the neck can slot over the button head Allen bolt and then slide in.
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