Mazworx RB25DET NEO Head Stage 3

The Mazworx RB25DET NEO Head Stage 3 is a fully built cylinder head package engineered for enthusiasts seeking enhanced strength, reliability, and performance on Nissan RB engines. Designed specifically for RB20, RB25, RB26, and RB30 engine codes, this upgrade transforms your NEO cylinder head to handle high RPM and horsepower demands efficiently.

This comprehensive rebuild replaces the factory valve buckets with durable Supertech buckets and incorporates custom Ferrea valves for improved airflow. The assembly is matched with high-performance Kelford cams and valve spring kits to optimize engine responsiveness and power output.

Labor and Machining

• Complete disassembly and sandblasting for a clean base
• Removal, drilling, tapping, and replacement of oil port plugs
• Stage 3 CNC port and combustion chamber porting for superior airflow
• CNC machining for cam clearance enhancements
• Modification for threaded freeze plugs
• RB26-specific head stud machining
• Valve guide removal, reinstallation, and reaming for precise fitment
• Professional race-grade valve job
• Cam lash setting and head resurfacing
• Final assembly of the cylinder head

Premium Components

• Kelford V-B camshafts with 268/280 duration and 11mm lift
• Kelford retainers paired with 110lbs BeeHive valve springs
• Kelford/Ferrea intake and exhaust valves, each oversized by +1mm for improved flow
• Supertech cam followers for durability
• Supertech bronze valve guides and valve seals for longevity
• Ferrea valve locks for secure valve retention
• Mazworx threaded freeze plugs and additional miscellaneous plugs

What You Need to Provide

To complete the upgrade, a core NEO cylinder head is required from the customer for rebuilding.

This Stage 3 cylinder head package is a meticulously crafted solution that meets the demands of serious RB engine builds. Whether upgrading for racing or high-performance street use, it enhances your engine’s capability to deliver reliable power with refined precision.