Supertech Inconel Exhaust Valve 30.00mm(+1) Set of 8 BRZ / 86 / FR-S 2013-2020 | SEVI-1052-2-8

Product Fitment:

2013-2016 Scion FR-S

2013-2020 Subaru BRZ

2017-2020 Toyota 86

Designed to meet the demands of today’s high-performance turbocharged engines, Supertech’s +1mm Oversized Sodium-Filled Exhaust Valves offer a superior combination of heat resistance, strength, and weight reduction. Manufactured from a high-grade Inconel/Nimonic alloy, these valves are engineered to thrive in extreme temperatures and high-pressure environments—perfect for modern performance builds.

The sodium-filled stems actively dissipate heat from the valve head, resulting in significantly lower operating temperatures. This not only extends the life of the valve but also enhances material integrity under load, giving tuners the freedom to run more aggressive spark timing and optimize performance.

Weighing approximately 10% less than conventional valves, these one-piece forged, non-magnetic valves are finished with a Superfinish stem for reduced friction, improved sealing, and better airflow.

Features:

• Head Diameter: 30.00mm (+1mm Oversized)

• Stem Diameter: 5.45mm

• Valve Length: 97.7mm

• Material: Inconel/Nimonic Alloy (non-magnetic)

• Groove Type: Single Groove

• Back-Cut Head & Undercut Stem for improved flow

• Sodium-Filled Stem for superior heat dissipation

• Friction Welded Wafer, hardened to 52 HRC minimum

• “Superfinish” Valve Stem with ultra-low surface roughness

• One-Piece Forged Construction for high strength and precision

Performance Benefits:

• Significantly reduced valve head temperatures

• Improved material strength and durability under extreme conditions

• Greater tuning flexibility with wider spark advance margins

• 10% average weight reduction for better valvetrain dynamics

• Enhanced airflow and sealing at high RPM

What’s in the Box?

• 8x Supertech +1mm Sodium-Filled Exhaust Valves