Supertech Performance AEVI-1106S-HS-8 Sodium Filled Inconel Exhaust Valve Set +1mm Oversize for VW/Audi 1.8T

These valves feature a +1mm oversized head diameter for improved flow characteristics and enhanced power output in boosted applications.

Key Specifications:

• Head Diameter: 30.90mm (+1mm oversize)
• Stem Diameter: 5.94mm (6mm sodium-filled stem)
• Overall Length: 103.90mm
• Material: Inconel 751/Nimonic alloy
• Single groove keeper design for high-RPM stability
• Sodium-filled for superior heat dissipation

Performance Features:

• Inconel construction provides exceptional heat resistance for turbocharged and high-boost applications
• Sodium filling enhances thermal management and valve longevity under extreme conditions
• Single groove keeper system grips the valve shaft directly for reliable retention at high RPM
• One-piece forged design ensures superior grain flow and strength
• CNC machined to exact tolerances for precise fitment
• Proprietary Superfinishing process guarantees flawless surface quality

Installation Notes:

• Must be used with Supertech single groove keeper KPR-6S7 (two keepers per valve, sold separately)
• Cylinder head machine work required for +1mm oversize valves
• Recommended for high-horsepower and high-RPM engine builds

Manufactured in San Jose, California, Supertech Performance valves are developed with over 20 years of racing and engineering expertise. Each valve undergoes rigorous quality control including ultrasonic testing, x-ray inspection, and heat treatment for stress relief, making them the preferred choice of professional engine builders for turbocharged and naturally aspirated performance applications.