GSC Exhaust Valve 29mm +1mm (Honda B-Series DOHC VTEC) GSC2033-01

GSC Exhaust Valve – Honda B-Series VTEC – 29mm +1mm Oversize – Single – GSC2033-01

Precision-built for high-performance Honda valvetrain upgrades

This +1mm oversized 29mm exhaust valve from GSC Power Division is designed for Honda B-Series DOHC VTEC engines. With a 5.5mm stem diameter and 102.60mm overall length, it delivers enhanced flow and reliable sealing under high-heat, high-RPM conditions.

GSC developed this valve line using advanced 3D simulation and modeling software to optimize strength and airflow. Each prototype is tested in its specific application to ensure maximum performance. The result is a high-flow valve head with reduced face distortion—providing better sealing and consistent performance over time.

Key Features:

• Swirl-polished heads improve airflow efficiency across the valve surface
• Back-cut design reduces valve weight for better RPM response and compatibility with aggressive cam profiles
• Micro-polished stems minimize oil retention and drag for smoother valve movement
• Exhaust valves made from modified 23-8n stainless for high heat resistance and extended durability
• Valve tips are either hardened or fused with stelite wafers to reduce wear and extend service life
• Tip heights are optimized to reduce setup time and maintain proper valvetrain geometry
• Keeper grooves are precision-tuned to balance spring pressures and reduce the need for shims
• Compatible with OEM or upgraded keepers/locks (reuse of old locks not recommended for performance builds)

Fitment:

- Honda Civic SiR (EG6, EG9) – 1992–1995 – B16A Gen 2
- Honda Civic Si (EM1) – 1999–2000 – B16A2
- Honda Civic Type R (EK9) – 1997–2000 – B16B
- Honda CR-X SiR (EF8) – 1989–1991 – B16A Gen 1
- Honda Integra GS-R (DC2) – 1994–2001 – B18C1
- Honda Integra Type R (DC2) – 1997–2001 – B18C5
- Honda Del Sol VTEC – 1994–1997 – B16A3
- Honda Civic SiRII (EK4) – 1996–2000 – B16A4 

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