Tomei Racing Intake + Exhaust Valve Set Honda Civic SI 2006-2011 | TA303A-HN01A

The Tomei Racing Valve Set for Honda K20 and K24 engines is engineered for serious high-performance applications requiring improved airflow, enhanced durability, and superior heat resistance. Designed specifically for naturally aspirated, turbocharged, and race-oriented K-series builds, these oversized valves help maximize cylinder head flow and engine efficiency at high RPM.

Built using premium motorsport-grade materials, Tomei’s race-spec valves are designed to withstand the extreme temperatures and stress associated with aggressive camshaft profiles, increased boost pressure, and extended high-rpm operation.

Key Features & Benefits

• Oversized valve design improves airflow and engine breathing
• Designed for high-horsepower and high-RPM K-series builds
• Intake valves constructed from SUH35 heat-resistant steel
• Exhaust valves made from Inconel 751 alloy for extreme heat resistance
• Precision-machined for improved sealing and durability
• Waisted stem design increases airflow efficiency
• Optimized for turbocharged, supercharged, and all-motor applications

Valve Specifications

Intake Valves

• Valve Head Diameter: 36.00mm (+1.0mm oversized)
• Stem Diameter: 5.48mm
• Length: 108.85mm

Exhaust Valves

• Valve Head Diameter: 30.50mm (+0.5mm oversized)
• Stem Diameter: 5.45mm
• Length: 108.65mm

Advanced Engineering

Tomei designed these valves with a focus on:

• Increased airflow velocity
• Improved combustion chamber efficiency
• Enhanced thermal stability
• Reduced valve restriction at high lift

The oversized head diameter and carefully engineered stem profile help improve both intake and exhaust flow characteristics, especially when paired with upgraded cams and ported cylinder heads.

Materials & Durability

Intake Valves

Constructed from SUH35 heat-resistant steel, a material commonly used in exhaust valve applications for increased durability under elevated temperatures. Tomei also applies a specialized coating for improved wear and corrosion resistance.

Exhaust Valves

Manufactured from Inconel 751, a nickel-based superalloy capable of handling extreme exhaust temperatures approaching 1000°C, making them ideal for boosted and endurance applications

Ideal Applications

• High-compression all-motor builds
• Turbocharged K-series engines
• Supercharged applications
• Track and endurance racing
• Drag racing builds
• Cylinder head porting and valvetrain upgrades

Installation Notes

• Professional installation strongly recommended
• Valve seat machining may be required for oversized valves
• Best paired with upgraded valve springs and retainers
• Valve lash adjustment required after installation
• Recommended for experienced engine builders and machine shops

Why Choose Tomei Valves?

Tomei is trusted worldwide for producing motorsport-grade engine components engineered to withstand extreme conditions. These racing valves are designed to increase airflow while maintaining the durability needed for high-horsepower K-series applications.