2JZ-GE – Billet Upper Water Neck
 
Modern cooling performance for the legendary JZ platform.
 
The Ichiban Engineering 2JZ-GE Billet Upper Water Neck was developed to replace the aging OEM cast housing with a stronger, more versatile, and motorsport-inspired solution for the Toyota 2JZ-GE engine platform.
 
Precision CNC-machined from 6061-T6 aerospace-grade billet aluminum, this upper water neck delivers superior durability, corrosion resistance, and a premium engine bay appearance while adding the flexibility required for modern cooling system setups.
 
Unlike the factory cast unit, the Ichiban Engineering design integrates multiple sensor and fitting options directly into the housing, allowing cleaner installation and simplified plumbing for both OEM-style and full custom AN cooling systems.
 
The outlet features an integrated ORB-threaded connection, compatible with our optional ORB-to-AN adapters. This allows the use of traditional barb fittings for OEM hoses or upgraded AN16 / AN20 cooling lines for high-performance applications.
 
During development, we carefully optimized the overall length of the housing to maintain proper OEM-style fitment once fittings are installed. The design is also fully compatible with 2JZ-GE VVTI engines, retaining the OEM VVTI line mounting location for a clean and factory-like installation.
 
Additional integrated sensor port options allow compatibility with common temperature sensor thread types including M12x1.5 (OEM) and 1/8-NPT, making the housing ideal for standalone ECU setups, aftermarket gauges, and motorsport applications.
 
Key Features
• CNC-Machined 6061-T6 Billet Aluminum
Manufactured from aerospace-grade billet aluminum for superior durability and corrosion resistance.
• Integrated Sensor Port Options
Compatible with M12x1.5 OEM sensors, 1/8-NPT sensors, and other common thread types.
• ORB Outlet Configuration
Allows flexible use of barb fittings or AN16 / AN20 cooling line adapters.
• Optimized Overall Length
Designed to maintain OEM-equivalent fitment once fittings are installed.
• VVTI Compatible Design
Retains the OEM VVTI line mounting point for proper fitment on VVTI engines.
• Motorsport-Ready Cooling Upgrade
Ideal for street, drift, drag racing, and custom turbocharged builds.
• Custom Anodized Finishes Available
Available in multiple anodized color options to match your engine bay.
• OEM Replacement Fitment
Direct replacement for the factory upper water neck assembly.
 
Built for modern JZ engine builds.

The Ichiban Engineering 2JZ-GE Billet Upper Water Neck combines OEM-inspired fitment with billet performance engineering to deliver improved reliability, flexibility, and engine bay aesthetics.
 
⚙️ Fits Toyota 2JZ-GE engines
⚙️ Compatible with VVTI applications
📧 For technical questions or fitting assistance contact sales@ichiban.engineering