Supertech Performance VWEVI-1004S-8 Inconel Exhaust Valve Set +1mm Oversize

These valves feature a +1mm oversize head diameter (29.00mm) for improved flow characteristics in ported cylinder heads.

Key Specifications:

• Head Diameter: 29.00mm (+1mm oversize from stock 28.00mm)
• Stem Diameter: 5.96mm
• Overall Length: 101.80mm
• Material: Inconel-Nimonic superalloy (Nimonic 751)
• Groove Type: Single groove design
• Required Keepers: KPR-6S/7 (two per valve, sold separately)
• Set Contents: 8 exhaust valves

Performance Features:

• Nickel-based Inconel superalloy construction for exceptional high-temperature strength and heat resistance
• One-piece forging with controlled grain flow for enhanced durability
• CNC machined to strict tolerances for precise fitment and optimal sealing
• Swirl-polished heads and validated profiles for improved airflow
• Patented Superfinish stem surface treatment reduces friction and wear
• Hardened tips support extended valve guide life
• Precision-ground seat faces ensure repeatable sealing and proper contact

Ideal for turbocharged, supercharged, and high-performance applications where elevated exhaust gas temperatures demand superior material properties. The Inconel alloy provides excellent oxidation and corrosion resistance while maintaining strength under sustained high-temperature duty cycles. These oversized valves are designed for use in cylinder heads that have been machined to accept the larger valve diameter, making them perfect for racing builds and performance engine rebuilds.