Supertech Nissan RB26 31.15x6.94x102.7mm +1.5mm Tip Incnl Exh Valve - Set of 12 (Req RET-NRB60-TS-2)

These Supertech exhaust valves are made with a specific material choice: a high-strength, heat-resistant alloy that can handle the intense temperatures and pressures found in the RB26 engine. Each valve measures 31.15mm in diameter at the head, with a 6.94mm stem and a total length of 102.7mm. They are designed with a +1.5mm tip and an undercut (incnl) feature, which helps reduce valve weight and improve airflow dynamics. This set includes 12 valves, which is the full quantity needed for a complete RB26 engine rebuild.

The material selection is crucial for exhaust valves, as they are exposed to the hottest gases exiting the combustion chamber. Supertech uses a specialized alloy known for its ability to resist burning and warping under extreme conditions, ensuring reliable performance and longevity. The undercut design on the stem is a subtle but important detail; it reduces the overall mass of the valve, allowing it to open and close more quickly and reliably, especially at higher RPMs. This can contribute to improved engine response and power delivery. The +1.5mm tip is a specific design choice that may be intended to work with certain camshaft profiles or cylinder head modifications, ensuring proper valve seating and sealing.

When rebuilding your RB26, using high-performance valves like these from Supertech is a key step in ensuring the engine can perform at its best. It's important to note that these valves require a specific retainer set, the RET-NRB60-TS-2, which is sold separately. Make sure you have this on hand before you begin installation to ensure a smooth and correct assembly process. Proper installation and valve-to-guide fitment are critical for optimal performance and engine health.