Nissan RB Head Drain Kit

HPR Nissan RB Head Drain Kit
Improve oil drainage and crankcase ventilation in your Nissan RB engine with the HPR Head Drain Kit.
 
Product Spotlight and Installation Video [HERE]
 
HPR has refined the traditional RB head-drain solution with a high-flow, direct-fit design that adds an additional passage between the cylinder head and engine block. This helps reduce pressure buildup in the bottom end while allowing excess oil to return from the cylinder head more efficiently.
 
The result is a compact, high-flow solution designed for demanding street, drag, drift and motorsport applications.
 
Improved Oil Drainage
At high engine speeds, oil can accumulate in the cylinder head faster than it can return to the sump. The HPR Head Drain Kit creates an additional return and pressure-equalization path between the head and block.
 
This can help:
Improve oil return from the cylinder head
Reduce oil accumulation in the head
Reduce crankcase pressure buildup
Support improved oil control at sustained high RPM
Improve reliability in high-performance applications
 
High-Flow Internal Design
The internal fitting uses a stepped centering guide that keeps the assembly properly positioned without restricting the lower section of the factory port. This design preserves available flow area and allows excess oil to drain more freely from the cylinder head.
 
Adjustable Swivel Outlet
The swivel outlet allows the fitting to be positioned at the most suitable angles for your hose routing and engine-bay layout. Once the desired position is selected, the assembly can be tightened securely using the included HPR hardware.
 
Direct Bolt-On Installation
The kit installs into the factory cylinder-head freeze-plug location.
No machining or re-tapping is required. Simply remove the factory plug, install the HPR assembly at the desired angle and tighten it to the engraved torque specification.
 
Features
High-flow AN-10 outlet
Adjustable swivel fitting
HPR valve-stem-style banjo bolt
HPR custom wing nut
Stepped internal centering guide
No restriction in the lower section of the port
Viton O-rings included
Pressure tested to 30 bar
Direct bolt-on installation
No machining or thread modification required
Torque specification engraved directly on the bolt
 
Fits Nissan RB twin-cam cylinder heads, including:
RB20
RB25
RB25 NEO
RB26
 
Included in the Kit
HPR head-drain fitting assembly
Swivel AN-10 outlet
HPR valve-stem-style banjo bolt
HPR custom wing nut
Viton sealing O-rings
 
Drain hose and engine-side return fittings are not included