V2 Has Landed!
 
Meet the ultimate cooling upgrade for your 1JZ and 2JZ-GTE engine — the Ichiban Billet Upper Water Neck, engineered specifically for the legendary JZ platform.
 
Designed to replace the dull OEM casting, this precision CNC-machined billet piece not only elevates the look of your bay but also delivers superior performance and reliability.
 
This V2 model introduces several key improvements over OEM:
 
Integrated M12x1.5 Sensor Port – allows you to install a temperature sensor directly into the neck (compatible with both OEM and aftermarket sensors).
Dual Outlet Capability – features a precision-machined hose lip for silicone connections and internal ORB threads for clean plumbing.
ORB-to-AN Fitting Options – easily adapt to -16AN or -20AN lines using our matching fittings for a seamless install.
O-Ring Sealed Flange – eliminates the need for messy gaskets and prevents leaks common in factory units.
 
This version is designed for setups running the OEM mechanical water pump, maintaining the original recirculation flow. For those running an external electric water pump, check out our dedicated RACE version — optimized for simplified routing and maximum flow efficiency.
 
Upgrade your JZ cooling system with billet precision and proven reliability. Built for performance, finished for perfection — Ichiban Billet Upper Water Neck