Mazworx RB25DET Stage 2 Cylinder Head

The Mazworx RB25DET Stage 2 Cylinder Head is engineered for high-performance Nissan RB series engines, specifically designed to support up to 800 horsepower. This cylinder head package enhances airflow and combustion efficiency to optimize engine power and reliability.

Porting and Machining

The intake and exhaust ports are precision CNC ported and enlarged to complement the +1mm Supertech valves. Combustion chambers are CNC machined to correspond with an 87mm bore, improving volume and flame travel for better combustion.

Components Included

• Supertech +1mm Intake Valves
• Supertech +1mm Inconel Exhaust Valves
• Supertech Bronze Valve Guides
• Supertech Single Spring Kit rated at 85 lbs
• Supertech Titanium Retainers
• Supertech Valve Seals
• Mazworx Threaded Freeze Plugs
• Additional miscellaneous plugs

Labor and Assembly

• Disassembly and sand blasting of the core head
• Removal, drilling, tapping, and replacement of oil port plugs
• Machining for threaded freeze plugs and RB26 head studs
• Advanced Stage 3 CNC port and chamber work
• Notching for cam clearance
• Valve guide removal, reinstallation, and reaming
• Professional race-spec valve job and valve lash setting
• Head resurfacing and complete assembly

Requirements

This package requires a core RB20/25/26/30 Nissan cylinder head and the installation of valve springs, seats, and keepers which are not included.

The Mazworx RB25DET Stage 2 Cylinder Head offers a comprehensive upgrade path for Nissan RB engines looking to achieve significant horsepower gains with quality components and expert machining.