Valve design has a direct influence on both airflow and long-term durability in a high-output RB26DETT. The Tomei Racing Valve Set (part number TA303A-NS05A) is a complete intake and exhaust package developed specifically for the Nissan RB26DETT, featuring a waisted stem profile and high-temperature materials suited to performance and boosted applications.
The waisted stem design reduces the cross-section in the critical flow area, allowing a greater volume of air and exhaust gas to pass around the valve as it opens. Intake valves are manufactured from SUH35 heat-resistant steel and receive a specialized coating to improve resistance to heat, wear, and corrosion. Exhaust valves are produced from Inconel 751, a nickel-based alloy chosen for its ability to withstand the extreme temperatures commonly encountered in turbocharged engines. Each valve is precision machined with attention to the head, face, stem, and lock groove to support reliable sealing and consistent operation.
This set is intended for serious RB26 builds where improved flow and elevated thermal resistance are required. At Terra Firma Automotive, we supply this genuine Tomei Racing Valve Set as a core valvetrain component for Skyline GT-R and other high-output RB26DETT projects. Whether the engine is being prepared for higher boost, higher RPM, or sustained track use, these valves deliver the material quality and flow-oriented design associated with Tomei. Choose Terra Firma Automotive for authentic Japanese performance valves that support durable, high-performance cylinder heads.
- Genuine Tomei Racing Valve Set
- Part Number: TA303A-NS05A
- Application: Nissan RB26DETT
- Complete intake and exhaust set
- 65mm Intake Head Diameter
- 97mm Intake Stem Diameter
- 30mm Intake Length
- 15mm Exhaust Head Diameter
- 94mm Exhaust Stem Diameter
- 20mm Exhaust Length
The waisted stem allows a greater volume of air/gases to enter and exit the combustion chamber as the valve extends.
Each valve is designed and precision machined specifically for the intended engine/application. The head, face, stem and lock groove designs have also been optimized to enhance sealing performance, efficiency and durability.
The intake valves are made using SUH35 HEAT RESISTANT STEEL which is more commonly used to make exhaust valves. These are then coated with a special formula that further improves the valves' resistance to heat, wear and corrosion. In order to withstand temperatures of up to around 1000℃, the exhaust valves are made using a nickel based heat resistant alloy, INCONEL 751.
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