Supertech Toyota 2JZ Sodium Filled Inconel Exhaust Valve - +1mm Oversize - Set of 12

Made from Inconel, a high-nickel alloy known for its exceptional strength and heat resistance, these Supertech exhaust valves are built to handle the demands of a high-performance Toyota 2JZ engine. The +1mm oversize design allows for a larger valve diameter, which can improve airflow into the cylinder, especially when paired with other engine modifications. Each valve is sodium-filled, a feature that helps to dissipate heat away from the valve face and stem, keeping temperatures lower and reducing the risk of valve distortion or failure under extreme conditions.

These valves are a solid choice for anyone rebuilding or significantly upgrading the top end of their 2JZ engine. The Inconel material is crucial for exhaust valves because it can withstand the intense heat generated by combustion, far better than standard steel alloys. This makes them ideal for boosted applications or engines that see frequent high-RPM operation. The sodium core inside the valve stem acts like a heat exchanger, transferring heat from the valve head to the stem, where it can be carried away by the valve guide and oil. This advanced cooling method is a key reason why these valves are chosen for serious engine builds.

This set includes 12 valves, enough for a complete engine. When installing these +1mm oversize valves, ensure your cylinder head has been properly machined to accept the larger diameter. It's also recommended to check valve seat concentricity and depth after installation to ensure optimal sealing and performance. For a complete rebuild, consider pairing these with appropriate valve springs, retainers, and seals to match the valve's performance capabilities.