Mazworx SR20DET Stage 2 Cylinder Head

The Mazworx SR20DET Stage 2 Cylinder Head is a precision-built upgrade, tailored to enhance performance and reliability for Nissan’s SR20 engine series. Developed with advanced CNC machining and meticulous assembly processes, this cylinder head ensures superior flow dynamics and durability for demanding racing applications.

Comprehensive Reconditioning and Precision Machining

Each cylinder head build begins with a thorough cleaning and preparation process to restore and optimize the core component:

• Hot Tank Cleaning: Removes all oil and grime from the cylinder head for a clean base.
• Sand Blasting: Eliminates corrosion and debris, restoring a uniform satin aluminum finish.
• Removal and Replacement of Oil Port Plugs: All oil port plugs are removed, re-tapped, and reinstalled for optimal oil gallery cleaning.
• Freeze Plug Machining: CNC machining prepares the freeze plug locations to accept Mazworx’s threaded and O-ringed freeze plugs.

Enhanced Engine Breathing

Optimizing airflow is critical for performance, and this cylinder head features advanced CNC porting and chamber design:

• Stage 3 CNC Porting: Ports and valve seats are widened and refined using a Superflow 600 flow bench to maximize flow efficiency.
• CNC Combustion Chamber Machining: Enlarges the combustion chamber to remove squish areas that can cause detonation at high boost, while improving valve airflow by deshrouding.
• Multi-Angle Valve Job: Multiple valve seat angles (up to five, plus radius on 90mm chambers) increase sealing and airflow.

Valve and Guide Restoration

Ensuring valve precision and durability, the cylinder head undergoes:

• Valve Guide Removal, Replacement, and Reaming: Worn guides are replaced with Supertech bronze guides for both intake and exhaust to meet specifications.
• Valve Seal Replacement: New Viton valve seals installed to maintain reliability and prevent leaks.
• Assembly: Installation of Supertech +1mm intake valves, +1mm Inconel exhaust valves with 6mm stems, dual spring kit (90lbs), and titanium retainers.
• Dual Guide Conversion and Rocker Level Setting: Rockers are machined for dual guides and set to cam specifications using a combination of new and existing guides.

Additional Options and Surfacing

• 1/2″ Head Stud Machining (Optional): Head stud holes can be machined to fit 1/2″ studs with dowel pin locations machined for 16mm dowels.
• Precision Surfacing: The cylinder head is resurfaced with a poly-crystalline diamond (PCD) tool to ensure a flat and reliable sealing surface.

Included Parts

• Supertech +1mm Intake Valves
• Supertech +1mm Inconel Exhaust Valves (6mm Stem)
• Supertech Dual Spring Kit (90lbs) and Titanium Retainers
• Supertech Bronze Valve Guides
• Viton Valve Seals
• Oil Port Pipe Plugs
• OEM Valve Guides x8
• Mazworx Threaded Freeze Plugs

Customer Responsibilities

• Provide a virgin core head with matching cam caps
• Provide usable rockers

This Stage 2 cylinder head build from Mazworx combines expert CNC machining, quality components, and thorough reconditioning to deliver a ready-to-install performance upgrade for your Nissan SR20DET engine.